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Source Naturals

L-Tyrosine, 500 mg, 100 Tablets

4.7 · 1951 reviews
1,285 ₽

Dietary Supplement Free Form Amino Acid L-Tyrosine is a free-form amino acid which crosses the blood-brain barrier. It is a precursor for the motivational neurotransmitters dopamine, norepinephrine, and epinephrine, as well as for thyroid hormones and enkephalins, important peptides which ease messages of physical discomfort. L-Tyrosine is also a constituent of amino sugars (glycosaminoglycans), which play a role in numerous biological functions.

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Dietary Supplement Free Form Amino Acid L-Tyrosine is a free-form amino acid which crosses the blood-brain barrier. It is a precursor for the motivational neurotransmitters dopamine, norepinephrine, and epinephrine, as well as for thyroid hormones and enkephalins, important peptides which ease messages of physical discomfort. L-Tyrosine is also a constituent of amino sugars (glycosaminoglycans), which play a role in numerous biological functions.

Customer reviews

4.0
verified purchase
not sure

now some people are writing about calming effect, others write about energising effect while i'm here stuck with no effect at all, and surely without a calming one which i was seeking for. when i took it for the first time together with inositol and some other aminos i felt a strong calming effect but it was only once. there's no change in my anxiety levels or insomnia. i will continue to take this anyway since i notice that most aminos improve my skin condition and help me feel better when i'm sleep deprived. most likely won't repurchase.

9/9/2013
5.0
verified purchase
Taken for low mood and energy

I have chronic fatigue, and started taking L-tyrosine daily, which really helped. However, I found that after a while it made me feel agitated. I read a report which recommended to take as needed - this didn't quite work for me, so I take one capsule three times per week, spaced a day or so apart, and this seems to work quite well.

1/20/2025
5.0
verified purchase
Great support for thyroid

I started taking L-Tyrosine by Source Naturals to support my thyroid and overall energy levels, and I can really feel the difference. Mental clarity improved, and I no longer feel that afternoon slump. It works well together with selenium and iodine - just make sure to monitor your thyroid levels if you have Hashimoto’s or hypothyroidism. The capsules are easy to take and gentle on the stomach. A great supplement for focus, mood, and thyroid support.

11/2/2025
5.0
verified purchase
My favorite form of Tyrosine

I have tried many forms of Tyrosine, and I would say that I prefer tablets more than capsules. Just in my case is it digests easier I guess. The tablet doesn't have unpleasant taste. It' s just casual taste that all tablets have. I have already described benefits in another L-tyrosine, as Helen Kornilova said, it helps body to produce neurotransmitters such as norepinephrine and dopamine in the state of constant stress. Can't measure if my energy level increased or trainings became more efficient. I guess tyrosine does in work in cellular level, and benefits remain.

1/28/2025
4.0
verified purchase
Tablets are thick, hard and probably too big for some people

I usually don’t have any issues swallowing tablets, but these tablets aren’t just big. They’re also made from very hard materials and quite thick. If they were flexible it probably wouldn’t be such an issue, but now it is. Product itself is fine, but the swallowing isn’t pleasant

7/30/2021
5.0
verified purchase
I like it!

I’ve been taking L-Tyrosine for a while now, and I can definitely notice a difference in my focus and energy levels. It helps me stay more alert, especially during stressful days or when I’m lacking sleep. I also feel like it improves my mood and motivation. The quality seems great, no side effects so far, and it’s easy to take. I usually take it in the morning on an empty stomach for better results. Overall, I’m happy with this product and would recommend it to anyone looking to support mental clarity and reduce stress.

4/6/2026
5.0
verified purchase
I use this for Thyroid problems

I love the way this helps me for enlarged thyroid. I take only 1/2 tablet in the mornings and it has reduced my thyroid. It was big! You could see it from the outside. I also take kelp each day. I love the source naturals brand, it's a trusted brand of good quality.

2/16/2026
5.0
verified purchase
Energy boost and alertness

This stuff is good quality. I notice a huge boost in energy but it’s been important to take it by itself as mixing with creatine or other amino acids causes some sickness for me. Great for muscle workouts and training for the benefit of added focus and strength.

1/5/2026
5.0
verified purchase
for mental clarity and stress resilience

Tablets are a strong, no-frills option if you’re looking to support mental clarity and stress resilience. As a free-form amino acid, tyrosine helps your body make key neurotransmitters like dopamine, norepinephrine, and epinephrine, which can boost mood and focus

11/16/2025
5.0
verified purchase
Great quality

The ingredients are top quality. The size of this is big. Not sure about energy or taste cuz I haven’t taken it yet so I don’t know it’s benefit. The packaging is nice !

11/8/2025