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Biotin, 1000mcg - 100 vcaps 
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Best L-Tyrosine, 500mg – 120 vcaps
22.03€
Quantity discount
| Quantity | 2 | 3 | 4 | 5+ |
|---|---|---|---|---|
| Price | 21.16€ | 20.71€ | 20.05€ | 19.39€ |
103 in stock
Estimated delivery time 5-7 business daysDoctor’s Best – Best L-Tyrosine
What is Doctor’s Best Tyrosine?
Doctor’s Best Tyrosine is a conditionally essential amino acid that is a precursor to the catecholamine transmitters, dopamine, epinephrine, and norepinephrine. These are vital messengers for the brain and the body’s other nerve networks. The thyroid gland also needs tyrosine to make the vital hormone thyroxine. Doctor’s Best L-Tyrosine supplies the pure L-form of tyrosine, an amino acid that has many important functions in the body. Tyrosine or 4-hydroxyphenylalanine, is one of the 22 amino acids that are used by cells to synthesize proteins.
How does it work?
Tyrosine is perhaps best known for its crucial role in the production of certain substances that have vital messenger actions in the brain and the rest of the nervous system. In dopaminergic cells in the brain, L-Tyrosine is converted to L-Dopa by the enzyme tyrosine hydroxylase, then to 3,4-dihydroxyphenylalanine (Dopamine), a precursor used both for the synthesis of catecholamine messengers (dopamine, epinephrine, and norepinephrine) and for making the pigment melanin. Increasing the levels of L-Tyrosine in the brain may help to alleviate the neurological decline of catecholamines that are typically decreased in states of dementia. Thus, catecholamines may act as antioxidants in the brain and be neuroprotective. L-Tyrosine helps prevent a decline in cognitive function in response to physical stress. Melanin, the body’s major pigment that contributes to skin, hair, and eye color, is synthesized from L-Tyrosine through a series of steps that begin with conversion to 3,4-dihydroxyphenylalanine. Melanin is very important for regulating the skin’s exposure to ultraviolet (UV) light. The melanin deposited in skin cells forms a barrier—known as supranuclear caps—to shield our DNA from UV radiation. Precursor for the nerve messengers dopamine, norepinephrine, and epinephrine (adrenaline) The catecholamines dopamine, epinephrine (adrenaline), and norepinephrine (noradrenaline) are integral to central nervous system functions such as cognition, emotion, memory, movement, and regulation of glands that secrete hormones into the blood. Their production can be limited by the amount of tyrosine available to the enzyme that converts tyrosine to 3,4-dihydroxyphenylalanine. Adrenaline and noradrenaline are released from the adrenal gland, often in response to stress, and are part of a broad-based physiologic response that can increase the metabolic rate of cells through adjusting a number of biochemical processes. Adrenaline and noradrenaline are also used to regulate nutrient metabolism, including to increase stored energy utilization by breaking down glycogen into simpler sugars and releasing fatty acids from triglycerides. Stress & Mood. Tyrosine at high doses has been shown to significantly promote positive behavior characteristics (like mood) and a superior response to stress in humans exposed to environmental or cardiovascular stressors. Precursor for thyroxine production by the thyroid gland The thyroid secretes two very important hormones, triiodothyronine (T3) and thyroxine (T4). These help regulate our metabolic rate, which closely approximates how intensely we manage our life processes. Hormones T3 and T4 also regulate oxygen use, cellular metabolism, and the body’s overall growth and development. One of the several steps leading to the formation of thyroid hormones requires that enzymes attach iodine to tyrosine.
| Best before | 2026-07-31 |
|---|---|
| Country of origin |
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10 reviews for Best L-Tyrosine, 500mg – 120 vcaps
Only logged in customers who have purchased this product may leave a review.
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Ecosupplements customer (verified owner) –
Doctors Best offers good quality products, non-GMO, gluten-free and vegan ingredients. There are very few ingredients, so you know you are consuming a good product. L-tyrosine gives me the energy boost I need to start my mornings. I love this product so much that I will buy it again.
Ecosupplements customer (verified owner) –
Provides lots of energy in the morning. No taste, good quality. The evening helps me relax and sleep. It seems to work for those who have issues with calming their brains enough to sleep peacefully. So, if you’re one of those people whose brain keeps working after you’re almost asleep, try this. It might help.
Ecosupplements customer (verified owner) –
My husband has ADHD and takes medication that helps his ADHD but gives him anxiety. He says it made a huge difference in his mood. He’s never noticed a difference with the supplements I’ve given him until this one – so that’s really saying something. I highly recommend this product.
Ecosupplements customer (verified owner) –
have suffered from hair removal for a few years now and have found that L-Tyrosine combined with Inositol can help with this. Not great results yet, not sure if this is a placebo effect as I just started taking it for a few weeks now but the bald patches on my scalp have definitely reduced ☺️
Ecosupplements customer (verified owner) –
I’ve only been taking them for a few weeks, but I notice that I’m not as depressed anymore and have a lot more motivation. I don’t think it’s the placebo effect either, as I was a bit skeptical about the effectiveness of this supplement at first. The delivery was also quite promotional, so I definitely recommend it!
Ecosupplements customer (verified owner) –
Good quality product from top doctors, great size but the composition seems a bit off to me, especially if you are on a high protein diet, you may not see the benefits as you would already be taking enough tyrosine. Although some people claim that this product can improve training abilities, researchers have not found any impact of tyrosine supplementation on performance or on energy, muscle or performance, I think it is because of the focus it creates they put it in some pre-workouts (better focus = better workouts = better gains)
Ecosupplements customer (verified owner) –
I take this to help with my hypothyroidism along with selenium and although it hasn’t been long I feel more energetic already! I can’t wait to do my 2 month blood work again and see if my thyroid is better. I’ll update and let you know, but so far so good!
Ecosupplements customer (verified owner) –
Honestly, this is one of the best products I’ve ever bought in my entire life. I tried to buy substitutes from pharmaceutical companies where the product cost three times as much. It is perfect in quality and price. It’s easy to digest and doesn’t interfere in any way (I have SIBO and IBS). If the review was helpful, please leave a like, thank you
anyutabizzz (verified owner) –
suffered from low energy and mood levels, everything around seemed so sad and gray, I just didn’t feel like myself. After extensive research and blood tests, I decided to give this supplement a try. to see if it really works, I had to stop taking additional supplements. The results have been amazing, I feel like myself again, lots of energy and more mental clarity. I trust this brand, the quality is excellent.
Annian (verified owner) –
bought this supplement because it increases stress tolerance and normalizes mood, improves concentration and memory, reduces fatigue from physical and mental activity, stimulates fat burning processes and normalizes thyroid function . I take tyrosine either in the morning 20-30 minutes before breakfast or 2 hours after a meal. Every time you should drink a glass of water, amino acids work best that way. Then you can enjoy your breakfast in peace. If you drink plenty of water and take it on an empty stomach, you will notice the effect.