20 Best L Tyrosine For Hair Growth [2024]

Are you looking for the best L Tyrosine For Hair Growth? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling L Tyrosine For Hair Growth.

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1 (180 Pills) L Tyrosine 1000mg Capsules Pills Brain Booster Supplement Vitamin for Focus, Memory,... (180 Pills) L Tyrosine 1000mg Capsules Pills Brain Booster Supplement Vitamin for Focus, Memory,...
2 Nutrafol Women’s Balance Menopause Supplement, Clinically Proven Hair Growth Supplement for... Nutrafol Women’s Balance Menopause Supplement, Clinically Proven Hair Growth Supplement for...
3 JOYLI L Tyrosine Gummies - All-Natural L-Tyrosine 1000mg Gummies - Helps with Depression and Anxiety... JOYLI L Tyrosine Gummies - All-Natural L-Tyrosine 1000mg Gummies - Helps with Depression and...
4 Growth Activator Hair Serum with Patent-Pending Ashwagandha Exosome Technology Growth Activator Hair Serum with Patent-Pending Ashwagandha Exosome Technology
5 Biotin Hair Growth Serum - Biotin serum & Hair growth oil and hair serum - Topical hair growth... Biotin Hair Growth Serum - Biotin serum & Hair growth oil and hair serum - Topical hair growth...
6 Nutrafol Women Hair Growth Supplement for Thicker, Stronger Hair (4 Capsules Per Day - 1 Month... Nutrafol Women Hair Growth Supplement for Thicker, Stronger Hair (4 Capsules Per Day - 1 Month...
7 Biotin 20,000mcg with Keratin, Organic Coconut and Zinc, Hair Growth Supplements, Biotin... Biotin 20,000mcg with Keratin, Organic Coconut and Zinc, Hair Growth Supplements, Biotin...
8 NOW Supplements, L-Lysine (L-Lysine Hydrochloride) 1,000 mg, Double Strength, Amino Acid, 100... NOW Supplements, L-Lysine (L-Lysine Hydrochloride) 1,000 mg, Double Strength, Amino Acid, 100...
9 Vegan Biotin Gummies For Adult & Kids | 90 Gummies | 5000 mcg 45 Servings | NON-GMO | Gluten,... Vegan Biotin Gummies For Adult & Kids | 90 Gummies | 5000 mcg 45 Servings | NON-GMO | Gluten,...
10 Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans with Biotin, Mixed Fruit... Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans with Biotin, Mixed...
11 Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Gummies, Strawberry, 200 Count Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Gummies, Strawberry, 200 Count
12 NOW Supplements, L-Tyrosine 500 mg, Supports Mental Alertness*, Neurotransmitter Support*, 120... NOW Supplements, L-Tyrosine 500 mg, Supports Mental Alertness*, Neurotransmitter Support*, 120...
13 EZ Melts Brain Supplements for Memory and Focus Support - Dissolvable Memory Vitamins to Promote... EZ Melts Brain Supplements for Memory and Focus Support - Dissolvable Memory Vitamins to Promote...
14 Biotin and Collagen Supplements, 10000mcg Biotin Gummies for Hair Growth, 100mg Collagen Gummies for... Biotin and Collagen Supplements, 10000mcg Biotin Gummies for Hair Growth, 100mg Collagen Gummies...
15 Sugarbear Vegan Hair Gummy Vitamins with Biotin, Vitamin C, Vitamin B-12, Zinc for Hair Skin & Nails... Sugarbear Vegan Hair Gummy Vitamins with Biotin, Vitamin C, Vitamin B-12, Zinc for Hair Skin &...
16 Integrative Therapeutics DHEA-5 - Adrenal and Thyroid Function Support Supplement* - for Women and... Integrative Therapeutics DHEA-5 - Adrenal and Thyroid Function Support Supplement* - for Women...
17 Biotin 10000 mcg + Zinc + Selenium, Pure, Vegan & Extra Strong, Best Supplement for Hair Growth,... Biotin 10000 mcg + Zinc + Selenium, Pure, Vegan & Extra Strong, Best Supplement for Hair Growth,...
18 Thorne L-Tyrosine - Amino Acid Supplement to Support Production of Dopamine and Norepinephrine - 90... Thorne L-Tyrosine - Amino Acid Supplement to Support Production of Dopamine and Norepinephrine -...
19 Focus Factor Kids Extra Strength Daily Chewable for Brain Health Support, 120 Count – Vitamins for... Focus Factor Kids Extra Strength Daily Chewable for Brain Health Support, 120 Count – Vitamins...
20 Natrol Biotin Beauty Tablets, Promotes Healthy Hair, Skin and Nails, Helps Support Energy... Natrol Biotin Beauty Tablets, Promotes Healthy Hair, Skin and Nails, Helps Support Energy...
Bestseller No. 1
(180 Pills) L Tyrosine 1000mg Capsules Pills Brain Booster Supplement Vitamin for Focus, Memory,...
  • ULTIMATE FOCUS SUPPLEMENT - Tyrosine is a Brain Booster supplement for focus, memory, clarity, energy and an adderall alternative that plays a...
  • L-TYROSINE 1000MG CAPSULES - Amino Acids Supplements are a key component in the synthesis of Thyroid Hormones which regulate the bodys metabolism and...
  • DEPRESSION AND ANXIETY - Our Ltyrosine capsules support the production of the neurotransmitters Serotonin and Dopamine Supplements by balancing mood,...
  • BRAIN BOOSTER MEMORY PILLS - Your brain needs to be trained just like your body and there's no better memory supplement for your brain than...
  • BYE BRAIN FOG - L tyrosine acts like a nootropic by focusing on the cognitive function of the brain and it's also responsible for creating melanin...
Bestseller No. 2
Nutrafol Women’s Balance Menopause Supplement, Clinically Proven Hair Growth Supplement for...
  • NATURAL HAIR GROWTH: 4 capsules per day of this clinically effective hair supplement promotes visibly thicker hair growth and more scalp coverage...
  • SUPPORTS HORMONE HEALTH: Improves hair growth by targeting root causes of thinning hair for women in peri- and postmenopause–like hormone shifts and...
  • CLINICALLY PROVEN TO IMPROVE HAIR GROWTH: 100% of women showed improved hair growth after 9 months, 93% saw less dryness and brittleness, and 93% felt...
  • THE #1 DERMATOLOGIST-RECOMMENDED HAIR GROWTH SUPPLEMENT BRAND*: Grow with the brand trusted by leading dermatologists to improve hair growth...
  • AWARD-WINNING FORMULA: Winner of the Best Anti-Aging Hair Supplement of 2021 Award from Harper’s Bazaar.
SaleBestseller No. 3
JOYLI L Tyrosine Gummies - All-Natural L-Tyrosine 1000mg Gummies - Helps with Depression and Anxiety...
  • 🔸【L Tyrosine Supplement】- Joyli L-Tyrosine is a powerful, nature-based support for brain wellness! Containing L Tyrosine 1000mg in a highly...
  • 🔸【Stay Calm Even Under Stress】- Joyli l tyrosine gummies release the tension in your mind fast! As you know, L-Tyrosine supports the production...
  • 🔸【Natural Mood Enhancer】- Feel the difference with Joyli! Our natural and sweet gummies help balance your mood and eliminate such issues as...
  • 🔸【Essential For Body Nutrient】- Besides such impressive health benefits as enhancing brain work and mood, Joyli l-tyrosine supplement helps...
  • 🔸【American Top Quality】- Joyli is dedicated to creating only Top Quality dietary supplements that help live much happier and healthier. That's...
Bestseller No. 4
Growth Activator Hair Serum with Patent-Pending Ashwagandha Exosome Technology
  • ACTIVATE VISIBLY THICKER HAIR: An extremely fast-absorbing and lightweight hair serum for women and men formulated with Ashwagandha Exosomes to boost...
  • NATURAL, VEGAN, & 100% DRUG-FREE: A clean formula that nourishes thinning hair and supports stronger-feeling, thicker-looking strands with clinically...
  • REVOLUTIONARY PLANT EXOSOME TECHNOLOGY: By upcycling the seeds from the same Ashwagandha in hair growth Nutraceuticals, Nutrafol unlocked a...
  • CLINICALLY EFFECTIVE INGREDIENTS: Formulated with a patented complex of powerful phytoactives clinically shown to improve hair density and visible...
  • THE #1 DERMATOLOGIST-RECOMMENDED HAIR GROWTH SUPPLEMENT BRAND.*: Grow with the brand trusted by leading dermatologists to improve hair growth...
SaleBestseller No. 5
Biotin Hair Growth Serum - Biotin serum & Hair growth oil and hair serum - Topical hair growth...
  • Hair growth for men & women - The Biotin hair growth serum women love and men rely on. Pureauty's Biotin hair serum is ideal for supplementing hair...
  • The Biotin Hair Care Authority - Pair our Biotin serum with our Biotin Shampoo and Conditioner for maximum hair support. Add this to your daily...
  • Premium Biotin Product - Our Biotin for hair formula is Non-Greasy, and made with premium ingredients. The secret lies in the formula of Biotin, D...
  • Biotin Hair Growth - Give your hair the appearance of thicker hair with our Biotin hair serum. The Biotin oil alternative, our hair thickening serum...
  • Non-greasy, A little goes a long way - We stand by our high quality standards. Our non-greasy Biotin hair serum is made in the USA and is never tested...
Bestseller No. 6
Nutrafol Women Hair Growth Supplement for Thicker, Stronger Hair (4 Capsules Per Day - 1 Month...
  • NATURAL HAIR GROWTH: 4 capsules per day of this clinically effective hair supplement promotes visibly thicker, stronger hair growth and less shedding...
  • FOR WOMEN’S BIOLOGY: Physician-formulated to improve hair growth from within by targeting the 6 root causes of thinning hair in women–including...
  • CLINICALLY PROVEN: 90% of women saw improved hair overall, 86% saw better hair growth, and 84% saw less shedding after 6 months in a clinical study....
  • THE #1 DERMATOLOGIST-RECOMMENDED HAIR GROWTH SUPPLEMENT BRAND*: Grow with the brand trusted by leading dermatologists to improve hair growth...
Bestseller No. 7
Biotin 20,000mcg with Keratin, Organic Coconut and Zinc, Hair Growth Supplements, Biotin...
  • Healthy Hair, Nail Growth: American Standard Supplements’ Biotin offers the highest potency in the market. One capsule contains 20,000mcg of Biotin...
  • Biotin is known for healthy nail and hair growth. Our Biotin is combined with Keratin, that is good for eliminating frizz and smoothen your hair. Zinc...
  • Skin, Nails & Hair Vitamins - Our Biotin with Keratin & Collagen capsules will improve skin, hair, and nail health. Biotin is good to prevent hair...
  • Raw material is purity tested to ensure each of our ingredients meets our high-quality standard and are superior quality. Each ingredient is...
  • As a small family business, here at American Standard Supplements, we only use highest quality ingredients without any artificial sweeteners, colors,...
SaleBestseller No. 8
NOW Supplements, L-Lysine (L-Lysine Hydrochloride) 1,000 mg, Double Strength, Amino Acid, 100...
  • Double strength vegan tablets/essential amino acid: Lysine is an essential amino acid that must be obtained through diet or supplementation.
  • SUPPORTS COLLAGEN SYNTHESIS: Necessary for the production of all proteins in the body and is required for the maintenance of the structural proteins...
  • Certifications/classifications: Soy free, non-GMO, vegan/vegetarian, nut free, made without gluten, dairy free, egg free, kosher. Note : Natural color...
  • GMP quality assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our...
  • Packaged in the USA by a family owned and operated company since 1968
Bestseller No. 9
Vegan Biotin Gummies For Adult & Kids | 90 Gummies | 5000 mcg 45 Servings | NON-GMO | Gluten,...
  • CLEAN AND HIGH POTENCY HAIR GROWTH: Potent 5000mcg Biotin Gummies to Prevent Hair Loss. Contains Biotin(VitaminB-7) that Improves Metabolism And...
  • VEGAN, EASY AND DELICIOUS: SHIFAA NUTRITION High Potency Biotin Gummies are Vegan and Non-GMO. Our Gummy Vitamins are also Easy To Chew with...
  • BENEFITS: SHIFAA NUTRITION Biotin Gummies Help Rebuild Tissues, Assist Cell Growth, Promote Child Development, Protect Brain and Nervous System, Boost...
  • QUALITY: Our Products Are Halal Certified and Proudly Made In The USA, within An FDA-Registered Facility Under Strict GMP Guidelines. SHIFAA NUTRITION...
  • 100% SATISFACTION GUARANTEE: Our Vitamins and Supplements are Made In A GMP Certified Facility For Quality, Purity, Potency. For Any Reason if You Are...
SaleBestseller No. 10
Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans with Biotin, Mixed Fruit...
  • One 180 count bottle of Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Jelly Beans
  • Jelly Bean vitamins include added Keratin, as well as Vitamin A, Vitamin C and Vitamin E
  • Non-GMO, vegetarian Biotin vitamins with no artificial flavor or sweetener
  • A great addition to your shelf of skin care products, with essential vitamins to support beauty from the inside (1)
  • Jelly Bean Biotin supplement in mixed berry, strawberry, and watermelon flavors
SaleBestseller No. 11
Nature's Bounty Optimal Solutions Advanced Hair, Skin & Nails Gummies, Strawberry, 200 Count
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
SaleBestseller No. 12
NOW Supplements, L-Tyrosine 500 mg, Supports Mental Alertness*, Neurotransmitter Support*, 120...
  • SUPPORTS MENTAL ALERTNESS/NEUROTRANSMITTER SUPPORT: Required for the production of the neurotransmitters dopamine, adrenaline, and noradrenaline, as...
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
  • PHARMACEUTICAL GRADE/HEALTHY GLANDULAR FUNCTION: L-Tyrosine is especially critical for the normal function of the thyroid gland.
  • CERTIFICATIONS/CLASSIFICATIONS: Dairy free, Egg free, made without gluten, Non-GMO, nut free, soy free
  • GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the now manufacturing process has been examined, including our...
Bestseller No. 13
EZ Melts Brain Supplements for Memory and Focus Support - Dissolvable Memory Vitamins to Promote...
  • Jitter-Free Formula –– Stop relying on caffeine to get through your day. Power through the afternoon wall with this energy and focus supplement....
  • Think it Through –– When we're depleted, we can't be at our sharpest. Give your brain a little helping hand with these B vitamin focus supplements...
  • Strive for Inner Balance –– The modern world is packed with stressors. This brain support supplement can help your mind calm the storm and support...
  • Dissolves Right on Your Tongue –– No water, no swallowing large tablets, no struggle. This memory vitamin melts in your mouth to make nutrients...
  • Manufactured in the USA –– Trust in products from reputable sources. All of our focus supplements for women and men are made with globally sourced...
Bestseller No. 14
Biotin and Collagen Supplements, 10000mcg Biotin Gummies for Hair Growth, 100mg Collagen Gummies for...
  • 【Update & Strengthen Formula】Delicious biotin gummies provides 10,000 mcg of Biotin and 100 mg [2-in-1 Highest Potency] of hydrolyzed collagen,...
  • 【Healthy Skin, Hair & Nails】What you get? Healthier hair, skin and nails! Biotin gummies is a B-complex vitamin that helps the body convert food...
  • 【Anti-aging & Immune Support】Our hair, skin and nails vitamins supplements with biotin and collagen for kids, women and men that promote the...
  • 【Premium & All-naturally】We are committed to providing you with highest quality ingredients and supplements. Our delicious orange flavored biotin...
  • 【Worry-free Service】All of our biotin gummies 10,000mcg supplements are manufactured cGMP approved facility. We sincerely provide natural herbal...
Bestseller No. 15
Sugarbear Vegan Hair Gummy Vitamins with Biotin, Vitamin C, Vitamin B-12, Zinc for Hair Skin & Nails...
  • We designed our vitamins for those who were looking for easy to eat vitamins without the struggle of swallowing pills. Improve overall health & hair...
  • This vegan formula is based on clinical trials that have shown these ingredients to help improve hair health.
  • Nourish your hair from within with our cruelty free gummy bear hair vitamins
  • Vitamin A, Biotin, Vitamin C, Vitamin D, Vitamin E, Vitamin B-6, Folic Acid, Vitamin B-12, Biotin, Pantothenic Acid, Iodine, Zinc, Choline, Inositol,...
  • No gelatin. No dairy. No gluten. No side effects.
Bestseller No. 16
Integrative Therapeutics DHEA-5 - Adrenal and Thyroid Function Support Supplement* - for Women and...
  • A 5-mg DHEA supplement that supports healthy aging*
  • DHEA is an important adrenal hormone that tends to decline with aging and increased stress*
  • Gluten free, dairy free and vegan
  • Contains no wheat, gluten, corn, soy, dairy, or artificial colors, flavors, or preservatives.
SaleBestseller No. 17
Biotin 10000 mcg + Zinc + Selenium, Pure, Vegan & Extra Strong, Best Supplement for Hair Growth,...
  • High-Potency Biotin Supplement – Formulated with 10000mcg of essential vitamins and minerals, biotin helps support hair growth and strength for...
  • Restore and Protect Skin and Nails – Along with Vitamin B7 our formula contains Zinc and Selenium which contribute to healthy hair, softer skin, and...
  • Metabolism and Cognitive Support – Biotin contributes to a strong metabolic rate, and balanced mood and psychological function, while Zinc and...
  • Non-GMO and No Additives – Our advanced, vegan friendly formula is free of magnesium stearate or other coatings to ensure faster bioavailability and...
  • Full Year Tablet Supply – This bottle of water-soluble biotin pills includes 365 small, easy-to-swallow tablets to support a year’s worth of daily...
Bestseller No. 18
Thorne L-Tyrosine - Amino Acid Supplement to Support Production of Dopamine and Norepinephrine - 90...
  • Positivity: Supports a healthy outlook*
  • Stress: Supports healthy stress management*
  • Thyroid: Nutritional support for the thyroid gland*
  • Adrenal: Supports optimal adrenal function*
  • Trusted: Thorne is chosen by champions and trusted by 100+ pro teams. Thorne is the only supplement manufacturer to collaborate with Mayo Clinic on...
SaleBestseller No. 19
Focus Factor Kids Extra Strength Daily Chewable for Brain Health Support, 120 Count – Vitamins for...
  • BRAIN HEALTH SUPPORT FOR KIDS: Focus Factor Kids Extra Strength is specifically formulated for kids to help support healthy brain function, with...
  • HIGH QUALITY INGREDIENTS: Like other parts of the body, your child's brain needs proper nutrition to perform, whether at home or school. Our formula...
  • GREAT TASTING FLAVOR: Our focus supplement for kids comes in a great-tasting berry blast flavor chewable that your kids will love to take every...
  • NO ARTIFICIAL FLAVORS OR SWEETENERS: Our trusted kids formula contains no artificial colorings, sweeteners, fragrances or preservatives. Plus, it is...
  • FOCUS FACTOR: We offer a range of products designed to help you find your focus.* Focus Factor has been America’s brain health supplement brand for...
Bestseller No. 20
Natrol Biotin Beauty Tablets, Promotes Healthy Hair, Skin and Nails, Helps Support Energy...
  • Helps to inhibit DHT to combat hair loss and excessive thinning hair
  • Increase Energy: Biotin, a B vitamin also known as vitamin H or B7 helps support the metabolism and assists in the conversion of food into energy
  • Advanced Formulation: Natrol’s unique fast dissolve tablet enables faster absorption and can be taken anytime, anywhere; No water needed
  • Great Taste: The beauty supplements great tasting strawberry flavor is vegetarian and is fast-acting and perfect for those that have a hard time with...

Having trouble finding a great L Tyrosine For Hair Growth?

This problem is well understood by us because we have gone through the entire L Tyrosine For Hair Growth research process ourselves, which is why we have put together a comprehensive list of the best L Tyrosine For Hair Growths available in the market today.

After hours of searching and using all the models on the market, we have found the best L Tyrosine For Hair Growth for 2023. See our ranking below!

How Do You Buy The Best L Tyrosine For Hair Growth?

Do you get stressed out thinking about shopping for a great L Tyrosine For Hair Growth? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching L Tyrosine For Hair Growth, which is why we have assembled a comprehensive list of the greatest L Tyrosine For Hair Growth available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for L Tyrosine For Hair Growth that you consider buying. Your questions might include the following:

  • Is it worth buying an L Tyrosine For Hair Growth?
  • What benefits are there with buying an L Tyrosine For Hair Growth?
  • What factors deserve consideration when shopping for an effective L Tyrosine For Hair Growth?
  • Why is it crucial to invest in any L Tyrosine For Hair Growth, much less the best one?
  • Which L Tyrosine For Hair Growth are good in the current market?
  • Where can you find information like this about L Tyrosine For Hair Growth?

We’re convinced that you likely have far more questions than just these regarding L Tyrosine For Hair Growth, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for L Tyrosine For Hair Growth, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible L Tyrosine For Hair Growth. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an L Tyrosine For Hair Growth buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available L Tyrosine For Hair Growth currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of L Tyrosine For Hair Growth has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an L Tyrosine For Hair Growth?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your L Tyrosine For Hair Growth.
  5. Customer Ratings: Number ratings grade L Tyrosine For Hair Growth objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their L Tyrosine For Hair Growth.
  7. Product Quality: You don’t always get what you pay for with an L Tyrosine For Hair Growth, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an L Tyrosine For Hair Growth is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining L Tyrosine For Hair Growth information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding L Tyrosine For Hair Growth is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: Is tyrosine good for hair loss?

A: L-Tyrosine and Hair Loss. The amino acid tyrosine plays an important role in how your body copes with stress.High stress levels may contribute to hair loss.

Q: What is tytyrosine and how does it work?

A: Tyrosine is believed to an anti-greying amino acid which can protect the natural colour of your hair. It is synthesised by the body from another amino acid called Phenylalanine. Also, by relieving stress and depression, it controls abnormal hair fall related to mood disorders.

Q: What are the benefits of L-tyrosine for hair growth?

A: L-tyrosine dietary supplements may help hair that has changed color and regrowing hair regain its natural color, according to the StopHairLossNow Network. L-tyrosine dietary supplements are available in tablet and capsule forms.

Q: What are the best supplements for hair growth?

A: Arginine can promote better blood circulation to the hair strands, for the scalp to better absorb all the vital nutrients. Studies also revealed that this amino acid could protect your hair from damage due to chemical treatments and bleaching. The natural sources of this agent are red meat, nuts and dairy products. 6. Tyrosine: