Tyrosine a precurser to hormones and Tyrosine products

Tyrosine a precursor to hormones

In the adrenal gland, Tyrosine is converted to levodopa by the enzyme Tyrosine Hydroxylase (TH). TH is also the rate-limiting enzyme involved in the synthesis of the catecholamine hormones dopamine, norepinephrine (noradrenaline), and epinephrine.

The thyroid hormones triiodothyronine (T3) and thyroxine (T4) in the colloid of the thyroid also are derived from tyrosine.

Here are L-Tyrosine products available direct from the United States. For people in the UK who wish to import these (this is allowed by customs, as they are for your own personal use), please check the exchange rate with this link to XE.com

L-Tyrosine by Solaray

L-Tyrosine
This product is an amino acid produced naturally by a microbiological fermentation process and is an essential component of protein found naturally in the human body. Click for more information and to purchase
L-Tyrosine
This product is an amino acid produced naturally by a microbiological fermentation process and is an essential component of protein found naturally in the human body. Click for more information and to purchase

L-Tyrosine by Source Naturals

L-Tyrosine
L-Tyrosine is a free-form amino acid which rapidly crosses the blood-brain barrier. It is a precursor for the neurotransmitters dopamine, norepinephrine and epinephrine, for thyroid hormones, and for and enkephalins, special peptides which subdue messages of physical discomfort. L-Tyrosine is also a precursor for the protective skin pigment melanin. Click for more information and to purchase

L-Tyrosine by Natures Plus


L-Tyrosine 500 mg
Nature's Plus is the first to offer a 100% pure L-Tyrosine capsule together with its synergistic partner, Vitamin B-6. Vitamin B-6 is an integral cofactor in the body's utilization of L-Tyrosine. Amino Acids, the famed building blocks of protein, are essential to the formation of muscle tissue and mass. They have widespread involvement in a range of bodily functions, including efficient brain function and the manufacture of energy. Click for more information and to purchase
L-Tyrosine 500 mg
Nature's Plus is the first to offer a 100% pure L-Tyrosine capsule together with its synergistic partner, Vitamin B-6. Vitamin B-6 is an integral cofactor in the body's utilization of L-Tyrosine. Amino Acids, the famed building blocks of protein, are essential to the formation of muscle tissue and mass. They have widespread involvement in a range of bodily functions, including efficient brain function and the manufacture of energy. Click for more information and to purchase

Products and supplements for healthy hair nails and skin

We have chosen a range of products to give you healthy hair nails and skin.
Please click on the product you would like to have indepth information on.

Omega-7 Plus Research has confirmed the benefits of Omega fatty acids, including Omega-7 palmitoleic acid. Omega-7Plus supplies these important nutrients with an Age-Defying Skin Complex including liquid silica, b Click for more information	Hair, Skin & Nails Schiff® Hair, Skin & Nails is a concentrated formula that provides critical nutrients that support healthy hair, skin and nails.• Hyaluronic Acid helps retain moisture in the skin.• Silica str Click for more information
Super Cinnamon Complex 1000 mg Powerful combination of Cinnamon, Biotin and Chromium Picolinate to support metabolism, provide antioxidant protection, and help maintain healthy blood sugar levels already in the normal range.• C Click for more information	Mineralash Mascara, Jet Black Formulated with Minerals, Biotin, Jojoba Oil, Vitamin E, and d-Panthenol, Mineralash mascara helps enhance lash growth by feeding, strengthening and conditioning the lashes in every nutrient-rich app Click for more information
Leave In Conditioner BWC Revitalize Leave-in Conditioner replenishes your hair with pro-vitamin B-5, biotin, and jojoba for maximum luster, body and manageability. Organic aroma-therapeutic essential oils of Ylang Ylang Click for more information	Volume Plus Shampoo for Fine Hair BWC Volume Plus Shampoo is a special, plant-based formula designed to gently cleanse fine hair while building fullness and body. Conditioning jojoba, penetrating plant proteins, panthenol, and biotin Click for more information
Active Lipoic Acid Active Lipoic Acid is a combination of R-Lipoic and alpha-Lipoic acids. R-Lipoic acid is an active isomer of lipoic acid added for increased activity. This formula is Sustained Release to control deli Click for more information	Biotin Biotin is one of the eight known B-complex vitamins. It is commonly referred to as vitamin B7 or vitamin H and can be found in such foods as liver, yeast, whole grains, soybeans and other meats. Vitam Click for more information
Energizer Vitamins and Minerals for Hair Nutrition A dietary supplement for thicker, fuller hair! Contains Biotin, Zinc and Silica Click for more information	High Potency Soft Multiple High Potency Soft Multiple Softgel, dietary supplement. High Potency, with Beta Carotene, Easy to Swallow. High potency of all RDI ingredients listed except Biotin, Calcium, Iron, Magnesium, Selenium, Click for more information
High Potency Soft Multiple High Potency Soft Multiple Softgel, dietary supplement. High Potency, with Beta Carotene, Easy to Swallow. High potency of all RDI ingredients listed except Biotin, Calcium, Iron, Magnesium, Selenium, Click for more information	Ultra Hair Conditioning Shampoo A nutrient-activated formula for all hair types, Ultra Hair Conditioning Shampoo is a nourishing formula designed to revitalize and condition the hair, while protecting its delicate pH and nutrient ba Click for more information
Hair Nutrients Hair Nutrients by Solaray is formulated with L-Cysteine and other supplements, such as biotin, to promote hair growth. Hair Nutrients is a special vitamin and mineral formula for the treatment of hair Click for more information	Hair Nutrients Hair Nutrients by Solaray is formulated with L-Cysteine and other supplements, such as biotin, to promote hair growth. Hair Nutrients is a special vitamin and mineral formula for the treatment of hair Click for more information
Biotin Biotin is an enzyme cofactor that assists in the release of energy from carbohydrates and in the production of fatty acids. Biotin also assists in activating the energy transfer molecule ATP. Click for more information	Folliderm NF FolliDerm-NF provides the nutritional building blocks of hair. These building blocks include methylsulfonylmethane (MSM) and Sulfonylin (sulfur-rich amino acids), which provide the dietary sulfur requ Click for more information
Beauty & Brains A dietary supplement designed specifically for women to support a youthful mind and body. Beauty & Brains has been designed to support healthy aging by helping to neutralize free radicals and protect Click for more information	Hair Kare Hair Kare, Superb vegetarian with 100 mcg of Biotin. Click for more information
Hair Force Hair force New Higher Potency Biotin Enhanced Support with MSM (Methylsulfonylmethane) Cutting Edge Guaranteed Potency Herbs Saw Palmetto and Centella Asiatica Essential Minerals and Vitamins for Hair Click for more information	Biotin B-Complex Thickening Conditioner Made with a healing complex of B vitamins to heal and stimulate the hair and scalp. With biotin to provide body and shine to hair, niacin to heal and nourish the hair while increasing scalp circulatio Click for more information
Biotin B-Complex Thickening Shampoo Made with a healing complex of B vitamins to heal and stimulate the hair and scalp. With biotin to provide body and shine to hair, niacin to heal and nourish the hair while increasing scalp circulatio Click for more information	Insopro R PrimaForce Insopro-R, scientifically formulated with high grade R-ALA and biotin, is a potent antioxidant and can increase your muscles uptake of glycogen. Insopro-R helps partition nutrients to lean Click for more information
Glucophase XR In order to fully understand what makes Glucophase XR such a great supplement, we need to give a brief history about its ingredients and their uses. We will also help to educate you about similar prod Click for more information	Hairball Relief Plus Pet Naturals of Vermont Hairball Relief Plus is a state-of-the-art supplement to help eliminate hairballs, reduce hairball formation and shedding, and support optimal skin and hair health in a delicio Click for more information
Repair Me Conditioning Detangling Mist Natural body, fullness and lift with instant detangling action. A light refreshing, leave-in conditioning mist that gives hair incredible lift and the look of new fullness - with no tangles. Condition Click for more information

High Potency Soft Multiple High Potency Soft Multiple Softgel, dietary supplement. High Potency, with Beta Carotene, Easy to Swallow. High potency of all RDI ingredients listed except Biotin, Calcium, Iron, Magnesium, Selenium, Click for more information	InsuLeanK InsuLeanK is comprised of the most potent glycemic agents in existence and is the perfect dietary supplement for improving insulin response/sensitivity and blood sugar control. By improving insulin se Click for more information
Hair, Skin & Nails Aids in proper protein assimilation to bolster normal hair and nail growth. Contains nutrients for the integrity of the skin and connective tissues. Aids in increased circulation and supports normal c Click for more information	Hair, Skin & Nails Aids in proper protein assimilation to bolster normal hair and nail growth. Contains nutrients for the integrity of the skin and connective tissues. Aids in increased circulation and supports normal c Click for more information
Wrinkle Rescue Skin Cream Enhanced Formula!Is youthful, glowing, vibrant skin on your wish list? NOW Wrinkle Rescue makes it easier than ever to rejuvenate your body’s natural anti-aging abilities. This silky smooth renewal c Click for more information	Biotin 5000 mcg Biotin is a water-soluble vitamin necessary for normal growth and body function. Biotin is a key regulatory element in gluconeogenesis, fatty acid synthesis, and in the metabolism of some amino acids. Click for more information
Biotin 5000 mcg Biotin is a water-soluble vitamin necessary for normal growth and body function. Biotin is a key regulatory element in gluconeogenesis, fatty acid synthesis, and in the metabolism of some amino acids. Click for more information	Ultra Skin Sustained Release Ultra Skin contains the perfect combination of ingredients, including high potencies of Unsaturated Fatty Acids, Zinc, Biotin, Vitamins A and E, plus many other essential nutrients. Click for more information
Ultra Skin Sustained Release Ultra Skin contains the perfect combination of ingredients, including high potencies of Unsaturated Fatty Acids, Zinc, Biotin, Vitamins A and E, plus many other essential nutrients. Click for more information	Biotin 5000 mcg Biotin is a water-soluble B-complex vitamin which is composed of an ureido (tetrahydroimidizalone) ring fused with a tetrahydrothiophene ring. A valeric acid substituent is attached to one of the carb Click for more information
Biotin 5 mg Biotin is a water-soluble vitamin. It is required by our bodies due to its involvement in carbohydrate, protein, and fat metabolism. Click for more information	Biotin 5 mg Biotin is a water-soluble vitamin. It is required by our bodies due to its involvement in carbohydrate, protein, and fat metabolism. Click for more information
Hair Revive 5 Hair loss in women has five major causes: inadequate nutrition, physical or emotional stress, thyroid levels, DHT buildup in follicles, and side effects of medication. Hair Revive 5 is a nutritional, Click for more information	Woman's Ultra Daily Twinlab® Women's Ultra Daily includes a superior vitamin/mineral foundation as well as proprietary blends that no other multi-vitamin has. Contains 100% or more of 18 Essential Nutrients. Clinically Click for more information
Blood Sugar Naturally Medical historians describe physicians who claim that diabetes mellitus is curable as quacks. Let the dog quack because pre-diabetes and early diabetes are reversible, at least for a period of years. Click for more information	Dicobalene V Dicobalene-V is a revolutionary B-complex vitamin unlike any other product on the market. It is active immediately upon absorption, while most B-12 products must be converted to methylcobalamin by the Click for more information
Magnesium Fizz Magnesium FIZZ combines optimal amounts of magnesium, vitamin C, potassium, vitamin B5 and B6, along with manganese, zinc, folate, biotin, chromium and selenium, in order to provide a magnesium-rich Click for more information	Suvaril For many of us, maintaining a healthy weight gets more difficult as we get older. Beginning in their 30s, most people experience a drop in metabolism. Their body simply stops burning fat as efficientl Click for more information
More Than A Multiple for Women More Than A Multiple For Women has everything a woman could want in a well-balanced comprehensive multivitamin. It features all of the key nutrients found in our New & Improved More Than A Multiple Click for more information	Purvana Hair, Skin, & Nails ~ Understanding Hair, Skin & Nails ~The structures of the hair, skin, and nail tissue are very similar, requiring almost identical raw materials to grow and remain healthy. Collagen is the most abunda Click for more information
Biotene H-24 Styling Gel Biotene H-24 Natural Extra Body Styling Gel contains silk proteins and biotin delivers extra control, sheen, moisture, and body to hair. Mill Creek Biotene H-24 Natural Extra Body Styling Gel. Thicker Click for more information	Biotene H-24 Natural Shampoo Biotene H-24 Natural Shampoo with Biotin Phase I is a rich shampoo containing biotin, keratin protein, nucleic acids and cysteine that nourishes hair and scalp and encourages thicker hair with increas Click for more information
Biotene H-24 Emulsion Biotene H-24 Natural Scalp Massage Emulsion with Biotin Phase Ill comes is in a base of biotin and may produce thicker, fuller-looking hair when under continuous usage for 30 days. Click for more information	Biotene H-24 Conditioning Hair Spray MillCreek Biotene H-24: Natural Conditioning Hair Spray with Biotin & NaPCA. Thicker Fuller Hair Naturally. Non-aerosol. Biotene H-24 Conditioning Hair Spray adds control to your hair, without leaving Click for more information
Biotene H-24 Conditioner Biotene H-24 Natural Conditioner with Biotin Phase II is a concentrated formula, rich in amino acids and panthenol that improves strength, increases moisture, reduces brittleness, and encourages healt Click for more information

Skin Eternal™ Cream Recharges and revitalizes delicate skin. Skin Eternal Cream helps your skin feel supple and replenished without a lingering oily feeling. Smooth under eyes or neck to infuse skin with visible radi Click for more information	Biotin 5000 mcg Lozenge Biotin is an essential B vitamin that plays a vital role as a coenzyme involved in protein systhesis and carbohydrate metabolism. It is also important to support healthy hair and fingernails. Deliciou Click for more information
Great Hair Great Hair is a time-release formulation containing 74 vitamins, minerals, herbs, and natural factors including biotin, L-cysteine, manganese, and iron to help regenerate hair follicles, and promote s Click for more information	More Than A Multiple™ MORE THAN A MULTIPLE has been redefined to include even more key ingredients, including Omega-3 and Omega-6 fatty acids, which are essential for health.New & Improved MoreThan A Multiple boasts a un Click for more information
Hair Factors Hair Factors is a synergistic formulation of nutrients needed to assist in hair growth and health. Highest potency with L-Cysteine & Biotin. Click for more information	Ultra Hair-Sustained Release Ultra Hair offers a mega B-Complex, with 500 mg of Pantothenic Acid, 2,000 mcg of Biotin, 400 mcg of Folic Acid and 100 mg of L-Cysteine, plus high potencies of Vitamins A and C, all combined in a spe Click for more information
Biotin 5000 mcg Two-Stage, Timed-Release.This product is designed so that half of the Biotin is rapidly released and the remaining is gradually released over the next 6 hours. A patent-pending, two-stage, timed rel Click for more information	Biotin Shampoo Used daily, this shampoo can help replenish important nutrients necessary for healthy scalp and hair. This therapy formula contians Biotin, a member of the B-complex family with other B-complex vitami Click for more information
Biotin Conditioning Gel This special conditioning treatment features Biotin and Cystine, one of the most important amino acids for healthy hair growth, and Elastin to help improve tensile strength. Cystine, a precursor to Ke Click for more information	Biotin Conditioner This rich blend features Biotin, an essential member of the B-Complex family with Keratin protein and collagen to help build stronger, more healthy hair. Keratin enables penetration of each individual Click for more information
Thin-to-Thick Scalp Elixir This revitalizing, preventative and corrective elixir purifies and energizes the scalp. Helps free hair follicles of debris which inhibit hair growth. Biotin, Folic Acid, Inositol, Cysteine(vege), (al Click for more information	Thin-to-Thick 4-Pack This special value pack contains all 4 essential steps to help revitalize scalp and build body.Step 1: The Pro-Vitamin Thin-to-Thick Hair Thickening ShampooGuaranteed to add at least 10% fullness to Click for more information
Biotin 5000 Biotin is a member of the B-Complex family and necessary for metabolism carbohydrates, fats and protein, the formation of anti-bodies.This product may be helpful in the treatment of:Hair lossDepressio Click for more information	MineralRich™ We have taken the world's mineral-richest soils and dissolved them in crystal clear water from the High Sierra foothills using our own unique method. The inviting and unique quality of MineralRich com Click for more information
Hair-Nails-Skin Vitol’s Hair-Nails-Skin enhanced with 2000 mcg biotin is a special nutrient essential to your system for gorgeous, healthy hair, beautiful skin and strong nails. Click for more information	Hair-Nails-Skin Vitol’s Hair-Nails-Skin enhanced with 2000 mcg biotin is a special nutrient essential to your system for gorgeous, healthy hair, beautiful skin and strong nails. Click for more information
Hair-Nails-Skin, One-a-Day's Hair Nails-Skin only 1 tablet per serving is designed to reflect the most current findings in human nutrition and herbal science. Augmented with a significant amount of Biotin 3000mcg. (3m mg) plu oth Click for more information	Hair-Nails-Skin, One-a-Day's Hair Nails-Skin only 1 tablet per serving is designed to reflect the most current findings in human nutrition and herbal science. Augmented with a significant amount of Biotin 3000mcg. (3m mg) plu oth Click for more information
Chamovera Shampoo Chamovera Chamomile Shampoo is a balanced shampoo for all hair types that gently cleanses hair, soothes the scalp and improves scalp condition. Home Health Chamovera Chamomile Shampoo. PH balanced fo Click for more information	Hair Formula Hair Formula, Certified Potency is a potent synergistic combination of herbs and vitamins formulated to help promote beautiful hair. Hair Formula is fortified with Horsetail, biotin, herbs and vitamin Click for more information
Shen Min Hair, Skin & Nails A specialized hair nutrient combining our popular standardized Shen Min® extract with a complete array of essential nutrients and co-factor ingredients designed specifically for women who desire natur Click for more information	Super B Complex This B-vitamin- complex contains a unique blend of vitamins B1, 2, 3, 6, 12, folic acid, biotin, pantothenic acid, choline, inositol, PABA and L-methionine. Because B-vitamins are used to support the Click for more information
Great Hair Great Hair is a time-release formulation containing 74 vitamins, minerals, herbs, and natural factors including biotin, L-cysteine, manganese, and iron to help regenerate hair follicles, and promote s Click for more information	B-Complex 50 There are a large number of B vitamins –all involved in the process of the metabolism of living cells.Working with proteins,they serve as coenzymes in the various enzyme systems of the body.B vitamins Click for more information
Skin Support Alpha Lipoic Acid: One of the most powerful anti-oxidants available, its unique advantages are that it is both fat and water-soluble. It scavenges free radicals and enhances the bodies natural defense Click for more information

Shen Min Advanced Hair Nutrient for Women Advanced Shen Min for Women is synergistically formulated to naturally enhance a woman's hair growth, strength and vitality, resulting in thicker, stronger hair and follicles. Bio-Tech has integrated Click for more information	Shen Min Advanced Hair Nutrient for Men Advanced Shen Min for Men is synergistically formulated to naturally enhance a man's hair growth, strength and vitality, resulting in thicker, stronger hair and follicles. Bio-Tech Corporation is prou Click for more information
More Than A Multiple MORE THAN A MULTIPLE has been redefined to include even more key ingredients, including Omega-3 and Omega-6 fatty acids, which are essential for health.New & Improved More Than A Multiple boasts a u Click for more information	Biotin 800 mcg Biotin is a water-soluble B vitamin. It is found in oatmeal, egg yolk, soy, mushrooms, bananas, peanuts, brewer’s yeast and many organ meats. Biotin is also produced in the intestine. It acts as a coe Click for more information
Biotin Caps 600 mcg Twinlab Biotin Caps - 600mcg - 100 capsules. Click for more information	Biotin 5 mg Country Life's Biotin is a yeast free high potency biotin in a vegetarian capsule. Biotin is a vitamin supplement necessary for healthy hair, scalp and nails. Click for more information
Ultra Hair-Sustained Release Ultra Hair offers a mega B-Complex, with 500 mg of Pantothenic Acid, 2,000 mcg of Biotin, 400 mcg of Folic Acid and 100 mg of L-Cysteine, plus high potencies of Vitamins A and C, all combined in a spe Click for more information