★★★★★
Great quality
IHeartYouBooBoo—December 28, 2023
High qualify supplement. After taking this for a week, I can say that I feel more alert and mentally focused. Read more
Source Naturals
Source Naturals L-Tyrosine -Free Form Amino Acid Supplement - 50 Tablets
$6.20$7.98
About this item
- Source Naturals 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 enkephalins, special peptides which subdue messages of physical discomfort. L-Tyrosine is also a precursor for the protective skin pigment melanin.
- Suggested Use: 1/4 teaspoon daily, mixed with water or juice between meals.
- Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
- Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health.
- Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration (FDA).
$6.20
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Product details
| Brand | Source Naturals |
|---|---|
| Flavor | Unflavored |
| Primary Supplement Type | L-Tyrosine |
| Unit Count | 50.0 Count |
| Item Form | Tablet |
| Item Weight | 0.2 Pounds |
| Special Ingredients | L-Tyrosine |
| Diet Type | Gluten Free |
| Product Benefits | Energy Management |
| Age Range (Description) | Adult |
Technical specifications
| is_discontinued_by_manufacturer | No |
|---|---|
| package_dimensions | 3 x 2 x 2 inches; 3.2 ounces |
| item_model_number | SN0189 |
| date_first_available | February 9, 2004 |
| manufacturer | Threshold Enterprises |
| best_sellers_rank | #86,406 in Health & Household ( See Top 100 in Health & Household ) #3,866 in Blended Vitamin & Mineral Supplements |
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Customer reviews
4.4263 ratings
Customers say
Customers find this amino acid supplement to be of high quality and effective, particularly for weight loss and thyroid health.
★★★★★
This supplement has been a life changer for me to restore my energy.
Marilyn—October 19, 2020
It was suggested by my physician to supplement with L-tyrosine to boost my thyroid function (i was low normal). What an improvement in energy and mood. Although these are 500 mg tablets, i cut them in half, and that seems better suited for my needs. Read more
★★★★☆
Works for more energy and focus
Dellherr—December 19, 2023
I really appreciated the extra energy and focus from this supplement. I did not take it every day, only when I woke up tired or knew I had a demanding day before me. The size of the tablet is not an issue for me as I just chew it into chunks that are easily swallowed with a glass of water. The taste is very bland with a ever so slight sweetness. However, I quit taking it altogether when I realized it was causing me to have uncomfortable urinary urgency. I stopped and started many times and always experienced the urinary urgency on the days I took the tyrosine. I have no idea what about it is causing the irritation, but I reluctantly had to say, "No more!" Read more
★★★★★
Sustainable energy!
Starla Hester—March 24, 2025
This is my favorite amino! I'm not able to take B vitamins or coffee for energy because it has the opposite effect on me so this is one of the only things that helps me with energy levels! Read more
★★★★★
This product has helped me when I've run a little sleep to remain focused throughout the day
Kevin McCraw—February 7, 2021
This is the only brand of L-Tyrosine I have yet to try but it definitely makes a difference and based on other reviews I'm going to stick with this company. Make sure if you're one of those severe migraine sufferers, read up before you take all l-tyrosine because it could make your condition worse unfortunately. For everyone else, this is a pretty good supplement. Read more
★★★★★
Really impressive for highly stressed individuals
Scarab of the Light—June 24, 2023
I recently got a new job that is extremely demanding and I also moved and the stress of the situation was hard to manage but after taking the supplement for a week I noticed a impressive boost in my cognitive ability and capacity to manage stressful situations effectively. Really helpful. Read the Wikipedia about l tyrosine for more details. Read more
★★★★★
Can't beat it
p. david miller—August 10, 2013
Source Naturals is one of the highest rated nutritional companies in the Comparative Guide to Nutritional Supplements study funded by the Canadian Government. This is a wonderful high quality bioavailable supplement that is fantastic for mood and Thyroid health. Read more
★☆☆☆☆
Pill is way too big
Customer—December 4, 2024
I was buying Solaray L-Tyrosine capsules and decided to try and save a bit and switch to Source Naturals. I take Source Naturals magnesium so I figured this capsule would be similar in size, its huge. Read more
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