10 Best-Selling and Popular Nootropics for You!

Introduction

An energy drink is okay, but it doesn’t work on your cognition. A balanced diet is remarkable, but your brain might be still deficient in certain nutrients. An exercise regime is great, but your brain is still craving for some movement. 

So, what have you decided to do for your brain? A concrete, balanced supplement can surely work for you. Yes, we are discussing the nootropics, not just the plain ones but the ones that are best-selling and are of premium quality. Our researchers helped us in this process, and we curated the following nootropic blends that are amazing and beneficial for your brain health. 

You can go through the following details. Also, you can check the respective official website of each supplement for further details. Supplement shopping should not be random or window shopping but must be done consciously and with a rational mindset. 

Nootropics – Do they really work?

Nootropics are dietary pills that help in enhancing the cognitive functions of the human brain and operate it optimally. However, all nootropics are not good for your health. Some nootropics contain stimulants like caffeine which can make you feel jittery or can interfere with your sleep schedule. While some nootropics contain fillers and artificial ingredients to boost your brain health on a whim and then you feel shattered and low. 

Well, if you are taking such nootropics with harmful ingredients, then it will surely not work for you. You need to research, think consciously and then decide to buy a suitable nootropic. There are several nootropics which are natural, safe, and efficient. A nootropic which is stimulant-free, all-natural, have better bioavailability and can also be digested better. Also, these are made in GMP-certified and FDA-approved facilities and hence, are potent and effective. 

So, if you are buying any of the nootropics after checking the ingredients, place of manufacture and the quality standards followed by the company, then you are wise. 

Why consume nootropics? 

Nootropics are suitable for brain cognition, but it largely depends on the ingredients added, the dosage, quality, and the cognitive functions it can perform. All those are healthy and you can surely gain a lot of brain health benefits out of these nootropics. 

Nootropics can do wonders for your brain – right from mental energy, blood circulation, brain waves, neural regeneration and neuroprotection. There is much more to the list. They can offer both short-term and long-term benefits to your brain health. Let us check some of these. 

1. Memory Recall 

Age can be a ruling factor in memory impairment, but nootropic comes to the rescue. It provides short-term memory, long-term memory and free recall benefits. Also, ingredients can boost the acetylcholine functioning and can offer you with memory creation and retrieval at the right time. 

Citicoline, bacopa and Vitamin B6 are some of the nootropics ingredients responsible for better memory recall. 

2. Mood 

Though mood is related to the mind, it is influenced by brain functioning. You must have noticed that you are low, and you cannot concentrate on a given task. Or you are enthusiastic and can be productive at your work. Mood also influences stress, depression, anxiety, and other disorders. 

L-theanine, bacopa and mane mushrooms are some of the ingredients that can enable blood circulation in the brain components effectively and influence your mood positively. These nootropics are not sedative but are brightening for your mind. 

3. Mental Energy 

Without any stimulants, nootropics work wonderfully and eradicate the fear of side effects. Nootropics increase your mental energy levels by enabling proper blood flow, nourishing and strengthening the brain, optimizing brain cells, and amplifying brain waves. Alertness, mental agility and quick processing are related benefits of these nootropics. 

4. Attention, Alertness and Wakefulness 

Some nootropics containing stimulants make you alert all the time, even at night, which is not at all needed. Nootropics improve cognitive functions by increasing your attention, focus, concentration and alertness. This is an excellent benefit in the world full of distractions and unwanted notifications. 

L-tyrosine, l-theanine and citicoline are some of the useful ingredients that can enhance the attention elements in your brain. 

5. Sleep Schedule 

There is a close relationship between sound sleep and optimum brain performance. Nootropics offer improvement in the sleep schedule as well as in the cognition. As they support calmness, relaxation and soothing feelings in the mind, you tend to sleep better at night without relying on any stimulants like caffeine. Once your sleep is completed optimally, your brain functions better the next day. Ingredients like L-Theanine perform this function better as per human research results. 

6. Stress Management 

Stress is the killer of your mental peace, productivity and performance levels. Why let it dwell in your mind then? It is the reason for burnout, which is becoming a common phenomenon amongst youngsters and old alike these days. 

Nootropic ingredients such as L-Theanine and L-Tyrosine help to fight against stress, recover your mind from burnout, and enable active thinking. So, for anti-stress benefits, a nootropic supplement is a must-try for everyone. 

7. Learning and Creativity 

Nootropics help you to stay calm during exams, learn new concepts in classrooms and also learn new things. So, it not only works on your learning abilities but also impacts your memory. 

As your mood and focus are improved, and you are relaxed, you can be more creative in your work or studies. This doesn’t mean that you will start painting on a canvas or write the next best-seller. It simply means that you will not find yourself in a rut and will do your job or studies more creatively and consciously. 

If you are an artist or an author, then you can gain more benefits out of the nootropics. They enable you to get rid of boredom and engage in creative activities mindfully. 

8. Motivation 

Without motivation, you are on an auto-pilot mode or a robot instead. Nootropics regulate dopamine and increase your mental energy levels, making you feel driven and motivated all the time. You will be less lazy and more motivated to do your work. 

Following are the long-term benefits of nootropics which we cannot ignore at all:

9. Anti-Ageing Benefits 

Nootropics can reduce cognitive decline due to ageing. You might think that you are only in the 20s and won’t need any nootropics. However, research has proven that cognitive decline will start even in the early 30s due to the sedentary lifestyle or genetics of a person. 

Nootropics which are loaded with antioxidants can safeguard your brain from ageing. Ingredients like pine bark extract and bacopa come to your rescue at any age. 

10. Neuroprotection

We always think for improvement in cognition and reduction in stress, but fail to recognize the protection factor. Nootropics provide neuroprotection and combat against free radicals. So, symptoms such as brain fog and forgetfulness can be reduced. 

11. Brain Regeneration 

As the brain is regenerating on a constant basis, new brain cells are increased, repaired and restored to learn and explore new things. Nootropics work on this brain regeneration aspect positively with ingredients like citicoline and pine bark extract. 

Top Nootropics in the market (Supplement name and its relevant purpose) 

The following table will show which nootropics of which brands are excellent, and the respective purpose of each supplement. 

Brand Name	Manufacturer Name	Suitable for?
BrainPill	Leading Edge Health	A synergistic formula, Brain Pill is for those who want to amplify the brain’s capacity to process and store information.
NooCube	Wolfson Berg Limited	NooCube is beneficial for those who have to multi-task or often communicate with the public. It also offers other brain health benefits due to its powerful ingredients.
Mind Lab Pro	Opti Nutra	Mind Lab Pro provides immediate, short-term and long-term brain health benefits. It is potent, highly effective and scientifically backed with evidence.
Performance Lab Mind	Opti Nutra	If you are stressed out, or are a student, or want to gain mental energy, then Performance Lab Mind is a valuable nootropic for you.
Nitrovit	Neuro Laboratories	If you want a versatile supplement for your brain health, then Nitrovit is the best suggestion offered by the experts.
Nootrogen	Vita Balance Limited	If you are consuming a multivitamin stack and need something for your brain, then Nootrogen is the best supplement to add.
NeuroFocus	Nuzena	If focus, memory power and cognition are your must-haves, then NeuroFocus will help you all the time.
Trubrain Nootropics Drinks	Trubrain	Tired of capsules? Want instant energy? Then, Trubrain Nootropics Drinks will serve the purpose of a good nootropic blended in a beverage with its fantastic formulation.
Vitamin B Complex 250mg	Bauer Nutrition	If you are deficient in Vitamin B Complex 250mg, then go for Vitamin B Complex 250mg capsules and win the battle called ‘life.’
Organic Ashwagandha	Nuzena	If you want to grab the benefits of the natural herb Ashwagandha without experiencing any side effects, then try Organic Ashwagandha, It is an anxiety-beater and a thyroid-regulator.

Time to know about the best-selling Nootropics in detail 

1. BrainPill 

Features 

• A perfect blend of potent and safe ingredients, BrainPill is perfect for accelerating your brain’s thinking, processing, and learning and concentration abilities. 
  
  
• It contains herbal ingredients and is an instant formula. 
  
  
• It’s composition – Citicoline, Bacopa, Huperzine A, Vinpocetine, Ginkgo Biloba, Vitamin B12, Vitamin B6, DHA Complex, PS, Tyrosine, L-Theanine, Vitamin B5, and Vitamin B9. 
  
  
• Leading Edge Health does not need a detailed introduction. It is itself a USP of this nootropic. 

Pros 

1. It improves memory recall, problem-solving capacity, learning and concentration. 
   
   
2. It fights fatigue, eliminates distractions, increases performance, and reduces brain fog. 
   
   
3. It also increases mental flexibility and productivity of a person. 

Cons 

1. Well, no cons as such apart from the fact that it cannot be purchased in retail pharmacy stores. 

Testimonials 

• Jeff, United States: “I had a brain fog problem. It reduces tremendously because of BrainPill supplements. Also, I experienced better mental clarity and the ability to solve complex problems easily.” 
  
  
• Ben, Canada: “I used to have mental fatigue even after working for 4 hours a day. I took a break from work, but it didn’t help. Then, I chose a nootropic, BrainPill, and it helped me in increasing my mental energy levels. Now, I am full of zeal and enthusiasm in the office and can work up to 8 hours a day.” 
  
  
• Luke, Australia: “Being a personal assistant, my job is to handle multiple tasks. There is no option as I have to follow my boss’ orders. But BrainPill helped me to multi-task and perform each job efficiently.”
  
   
• Rocky, Singapore: “I am recommending BrainPill to all my friends and relatives because it is indeed a fantastic nootropic. It is legal, as well as safe.” 
  
  
• Lance, South Africa: “I had heard about nootropics, but BrainPill is something all-natural, and so, I tried it. I loved the results of this health product.” 

2. NooCube 

Features 

• A cognition-improvement supplement that is potent, powerful and safe is NooCube. 
  
  
• Also known as smart drugs, NooCube contains 7 ingredients, namely Alpha GPC, Huperzine A, Cat’s claw, Bacopa, Oat Straw, L-Theanine, L-Tyrosine. 
  
  
• The brand is reputed and offers benefits like a money-back guarantee. 
  
  
• NooCube is also appreciated by worldwide customers. 

Pros 

1. It improves the brain’s functioning, memory, concentration, focus and mental energy levels. 
   
   
2. It makes you a good communicator with full confidence and zero nervousness. 
   
   
3. It helps you to multitask better. 

Cons 

1. It is only available online, but you can get free delivery options. 

Testimonials 

• Arian, United States: “I can handle multiple tasks at the same time with the same concentration levels. It is all because of NooCube that I won the Best Employee of the Month award.” 
  
  
• Louis, Canada: “I feel energetic during the day without taking coffee. NooCube has given me a productive life that I always desired.” 
  
  
• Maria, Australia: “Now, no more fumbling, being nervous and stammering while giving a public speech. NooCube has made me a super-confident and energetic person in the office.” 
  
  
• Nat, United Kingdom: “Being a master’s student, I also do an internship. It was difficult to juggle between work and studies. But with NooCube, everything is possible.” 
  
  
• Arif, UAE (Dubai): “I am a regular buyer of NooCube supplements. I am consuming it for the last 6 months.” 

3. Mind Lab Pro 

Features 

• Mind Lab Pro is a brainpower nootropic and an optimizer for the human brain functioning. 
  
  
• It also provides instant concentration and focuses on benefits. 
  
  
• It is packaged with 11 scientifically proven ingredients – Citicoline, Phosphatidylserine, Lion’s Mane Mushroom, Bacopa, L-Theanine, Rhodiola Rosea, NALT, Maritime Pine Bark Extract, Vitamin B6, Vitamin B9 and Vitamin B12. 
  
  
• It is legal, vegan-friendly and eco-friendly as well. 

Pros

1. It improves learning abilities, processing speed, and creative thinking. 
   
   
2. It relaxes the mind, increases confidence, and improves memory recall. 
   
   
3. It enables better communication, strategic thinking, and alertness. 
   
   
4. It also increases a person’s focus and concentration skills.  

Cons 

1. It is not available on Amazon, but purchasing it from the official website is not a hassle. 

Testimonials 

• Jeremy, United Kingdom: “I have become extra-productive due to Mind Lab Pro.” 
  
  
• Leo, United States: “You need to be hydrated while consuming Mind Lab Pro or else it might give you a slight headache. But if you drink sufficient water daily, it will be powerful for your brain.” 
  
  
• Andrew, Ireland: “I am a student and had concentration difficulties due to the distractions. But with Mind Lab Pro, I can recall and focus well.” 
  
  
• Jonty, Australia: “I am no more nervous or shy person during public speaking. All the new confidence is because of Mind Lab Pro supplements.” 
  
  
• Robin, Philippines: “I am feeling better, focused, productive and alert without any jerky feelings. Mind Lab Pro is highly recommended.” 

4. Performance Lab Mind 

Features

• An excellent brain cognition nootropic, Performance Lab Mind is great for brain health and recovery benefits. 
  
  
• It free from stimulants, GMO, fillers, gluten and soy. 
  
  
• It consists of Citicoline, Phosphatidylserine, NALT, and Maritime Pine Bark extract. 
  
  
• It has a clean manufacturing approach and benefits everyone, from learners to working people. 

Pros 

1. It provides mental energy without the use of stimulants. 
   
   
2. It supplies blood and other nutrients to the brain on a constant basis. 
   
   
3. It fights against stress, improves learning and memory recall. 
   
   
4. It is vegan-friendly and suitable for gluten intolerants. 

Cons 

1. No offers right now, but you can be hopeful about the future. 

Testimonials 

• Emma, United Kingdom: “Performance Lab Mind is research-backed and works for memory and good sleep. So, I have been consuming it for the last two years.” 
  
  
• Oliver, United States: “There are no side effects of Performance Lab Mind as it is free from stimulants and additives. And also, it is effective.” 

5. Nitrovit 

Features 

• This is a popular memory focus nootropic that lets you concentrate for 8 hours at a stretch. 
  
  
• It provides nutritional support, antioxidants, and improves blood circulation to all the brain components. 
  
  
• It consists of Alpha GPC, Alpha lipoic acid, BioPerine, guarana powder, shilajit powder, taurine, uridine, Vitamin B6, Vitamin B12, mucuna pruriens extract, Huperzine A and many others. 
  
  
• It is also good for physical health, along with brain health benefits. 

Pros 

1. It improves focus, attention, alertness and clarity. 
   
   
2. It improves memory recall, motivation, and efficiency, learning, and sleep quality. 
   
   
3. It enhances mood, reduces anxiety and repairs brain cells. 
   
   
4. It vanishes brain ageing signs in older adults. 

Cons 

1. It is available only on the official website of Nitrovit and not on other e-commerce portals. 

Testimonials 

• Ava, United States: “I have never been productive and focused before. This is all because of Nitrovit supplements.” 
  
  
• Logan, United Kingdom: “The customer service is splendid. They helped me in tracking my order. I also loved the results. I can learn and focus better now.” 

6. Nootrogen 

Features 

• Nootrogen is a valuable supplement in the stacks and consists of clinically researched ingredients for brain improvement. 
  
  
• It elevates your thought patterns and cognition and has been proved in an in-depth study. 
  
  
• It contains DMAE, glutamic acid, acetylcholine, magnesium, Vitamin B3, Vitamin B5, Vitamin B6, and bacopa extract. 
  
  
• A multivitamin stack is incomplete without Nootrogen as it is great for your mind and brain health. 

Pros 

1. It enhances memory recall and concentration skills. 
   
   
2. It speeds up the brain processing rate of information and important details. 
   
   
3. It calms down your nerves and lets the anxiety fade away significantly. 

Cons 

1. No offers right now, but there is a hope of discounts in the future. 

Testimonials 

• Grace, United Kingdom: “It has resolved my problems of anxiety and insomnia. Nootrogen is definitely powerful and potent.” 
  
• Finn, United States: “I do not trust any supplement randomly. I checked the scientific evidence associated with Nootrogen and tried it. Believe me; it is super-effective.” 

7. NeuroFocus 

Features

• Prepared by healthcare experts, NeuroFocus supplements are excellent for brain functioning, and cognition. 
  
  
• It is free from gluten and GMO. 
  
  
• It facilitates the process of synaptic plasticity in the brain and affects cognition favorably. 
  
  
• It is comprised of bacopa, DMAE, glutamic acid, niacin and magnesium. 

Pros 

1. It ensures memory recall, focus, concentration and better cognition. 
   
   
2. It is suitable for students, business owners, working professionals and even athletes. 
   
   
3. It is a sustainable, all-natural product and comes with discounted packages. 

Cons 

1. You cannot buy a single bottle but a package of at least 2 bottles. 

Testimonials 

• Rodrigo, United States: “I am a student, and NeuroFocus helped me in gaining focus in the classrooms, concentration during studies, and better learning abilities. I am grateful to this brand and product as well.” 

8. Trubrain Nootropics Drinks 

Features 

• People tired of swallowing capsules and tablets can surely go for Trubrain Nootropics Drinks for instant mental and physical energy. 
  
  
• With a robust customer base across the globe, this should be a must-have for intense work or studies. 
  
  
• The perfect way to ditch those harmful energy drinks is these nootropics drinks. 

Pros 

1. It provides a person with memory, mental performance levels, and focus. 
   
   
2. It replaces those nasty flavored capsules, and it can be carried anywhere. 
   
   
3. It contains caffeine, L-theanine, uridine, noopept, magnesium, tyrosine, carnitine and citicoline. 

Cons 

1. Capsule-lovers might not like this product. 

Testimonials 

• Charlotte, United States: “I can learn better and memorize my notes with Trubrain Nootropics Drinks.” 
  
  
• Aron, Canada: “I can drink Trubrain Nootropics Drinks anywhere and gain instant energy. This is the best thing about this health product.” 

9. Vitamin B Complex 250mg 

Features

• A 100% all-natural supplement fortified with all the essential B Complex Vitamins is the Vitamin B Complex 250mg. 
  
  
• It contains ingredients such as Brewer’s yeast, thiamine, calcium pantothenate, magnesium, biotin, folic acid, Vitamin B12 prep., nicotinamide and others. 
  
  
• It resolves various health issues and restores the B vitamin deficiency. 
  
  
• It is good for your mind as well as your body. 
  
  
• It does not replace a balanced diet but supports it by supplying you with the essential nutrients.  

Pros 

1. It enhances a person’s mindset, vanishes mood swings, and calms down your mind. 
   
   
2. It resolves sleep-related problems, including insomnia. 
   
   
3. It energizes you and also helps in weight loss. 
   
   
4. It enhances memory recall, concentration, focus and provides other brain health benefits. 

Cons

1. Though it can be purchased only online portals, you cannot miss the awesome services of this brand.  

Testimonials 

• Mateo, Malaysia: “Vitamin B Complex 250mg resolved all my sleep problems and improved my sleep quality. As a result, I can now concentrate better during the day and achieve more goals.”
  
  
• Philip, South Africa: “Vitamin B Complex 250mg gives me energy and reduces my body fat too. I was deficient in B Vitamins, and this supplement has helped me always.” 

10. Organic Ashwagandha 

Features 

• People seeking the benefits of Ashwagandha herb should try Organic Ashwagandha of Nuzena. 
  
  
• It is excellent in providing mental health benefits such as a reduction in stress, and more concentration levels. 
  
  
• Free from gluten, GMO and fillers, this is a pure and natural product with the easy returns policy. 
  
  
• It contains Organic Ashwagandha and Organic black pepper. It regulates thyroid, combats anxiety and enhances a person’s mood. 

Pros 

1. It is good for people undergoing stress and anxiety levels. 
   
   
2. Those who have thyroid issues can also take this supplement. 
   
   
3. It has a return policy, free shipping on specific orders and a friendly customer support team. 

Cons 

1. It does not contain other nootropic blends, so it might be a problem for those who want a versatile supplement containing maximum ingredients. 

Testimonials

• Adriana (Hamilton Hamilton, New Zealand): “Organic Ashwagandha helped me in extreme stress levels at my workplace, and I could feel lighter and better. I sleep soundly and work more during the day.”
  
  
• Minal, (Delhi NCR, India): “Organic Ashwagandha is a good, healthy motivator to keep you productive all day.”
  
  
• Ben (Leeds, United Kingdom): “It has been a week, and I feel more energetic and less anxious. I will continue to notice its long-term effects.” 

Details of the 10 Best-Selling Nootropics 

Supplement Name	Details of a Supplement
BrainPill	Price: The package of 3 bottles is priced at $249.98.  Offers: Save up to $120, [Check Latest Offer Price from here] Brand: Leading Edge Health  Coupon Code Available: Not right now.  Money-Back Guarantee: 60-days money-back guarantee is available.  Shipping: Express and regular shipping options are available.  Customer Support: Yes.
NooCube	Price: $59.99 for 1 bottle.  Offers: 1 bottle free on a package of 2 bottles, 3 bottles free on a package of 3 bottles. [Read More] Brand: Wolfson Berg Limited  Coupon Code Available: Not right now Money Back Guarantee: Yes  Shipping: Fast and Free Express Shipping Customer Support: Yes.
Mind Lab Pro	Price: $65 for 1 Month Supply.  Offers: 1 box is free on the package of 3 boxes. Shipping is also free. [Read More] Brand: Opti Nutra  Coupon Code Available: Not right now.  Money-Back Guarantee: Yes. 60-day money-back guarantee is available.  Shipping: Fast shipping. Free shipping is available only on the 3-month package.  Customer Support: Friendly and timely service is available.
Performance Lab Mind	Price: $50 for 1 bottle of 30 capsules.  Offers: Save $20, [Learn More] Brand: Opti Nutra  Coupon Code Available: Not right now.  Money-Back Guarantee: Yes. 30-day money-back guarantee is available.  Shipping: Shipped within 24 hours.  Customer Support: Friendly and timely customer service is available.
Nitrovit	Price: $59.97 for 1 bottle.  Offers: You can save $59.97 on a package of 3 bottles, and $109.95 for a package of 6 bottles. [Read More] Brand: Neuro Laboratories  Coupon Code Available: Not right now.  Money-Back Guarantee: One-year money-back guarantee.  Shipping: Free shipping on the packages of 3 and 6 bottles respectively.  Customer Support: Yes.
Nootrogen	Price: $29.95 for 1 bottle.  Offers: 1 bottle is free on a package of 3 bottles.  Brand: Vita Balance Limited  Coupon Code Available: Not right now  Money Back Guarantee: 14 Days Shipping: Fast shipping  Customer Support: Yes
NeuroFocus	Price: $60.00 for a package of 2 bottles (One bottle free). Offers: 3 bottles free on a package of 3 bottles, 3 bottles free on a package of 4 bottles. [Read More] Brand: Nuzena  Coupon Code Available: Not right now.  Money-Back Guarantee: Please check with the customer support.  Shipping: Fast shipping available.  Customer Support: Yes.
Trubrain Nootropics Drinks	Price: $49 per month for 20 drinks.  Offers: Yes, on bulk packages. [Find Here] Brand: Trubrain  Coupon Code Available: Not right now.  Money-Back Guarantee: Yes. Please check the website.  Shipping: Free shipping for US customers. For others, nominal charges are levied.  Customer Support: Yes.
Vitamin B Complex 250mg	Price: $54.95 for one bottle Offers: One bottle free on a package of 2 bottles,  3 bottles free on a package of 3 bottles. [Read More] Brand: Bauer Nutrition  Coupon Code Available: Yes. On Flash Sale days.  Money-Back Guarantee: Yes, 60-day money-back guarantee is available.  Shipping: Fast and free worldwide shipping available.  Customer Support: Yes, friendly and timely support is available.
Organic Ashwagandha	Price: $60 for a package of 2 bottles (one bottle free)  Offers: Buy 3 bottles-get 2 for free, buy 4 bottles-get 3 for free Brand: Nuzena  Coupon Code Available: Not available, but offers are available. [Read More] Money-Back Guarantee: Contact customer support.  Shipping: Fast, Free on orders above $50.  Customer Support: Yes

Summary 

Conclusively, you have got all the information about the best-selling and best-quality nootropics in this article. We hope that you will make the best use of this curated information and justify our time and efforts involved in the same. 

References 

1. https://www.ncbi.nlm.nih.gov/pubmed/2980693 – Nootropics and cognitive decline in mature adults 
2. https://embryo.asu.edu/pages/nerve-growth-factor – Nootropics and balanced mood. 
3. http://hyperphysics.phy-astr.gsu.edu/hbase/Biology/mitochondria.html – Nootropic ingredients and mental energy levels. 
4. https://news.harvard.edu/gazette/story/2015/03/tuning-in-on-brain-waves/ – L-Theanine and alertness. 
5. https://labs.wsu.edu/sprc/sleep-and-performance-research-labs/human-sleep-and-cognition-laboratory/ – Connection between sleep and brain functioning. 
6. http://journals.sagepub.com/doi/abs/10.1177/001872088402600404 – Essentials of learning. 
7. https://www.cambridge.org/core/journals/advances-in-psychiatric-treatment/article/ageassociated-memory-impairment-and-related-disorders/981C0A666DBD955A4D7D114D09308158 – Cognitive decline. 
8. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3614697/ – What causes brain aging?