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Source Naturals

L-Tryptophan, 500 mg, 60 Capsules

4.5 · 1608 reviews
1,301 ₽

Dietary Supplement Mood, Relaxation, Sleep The essential amino acid L-tryptophan helps support relaxation, restful sleep, and positive mood. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response and sleep/wake cycles. L-Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L-tryptophan converts to niacin in the body, which supports circulation, a healthy nervous system, the metabolism of food, and the production of hydrochloric acid for the digestive system. Source Naturals L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality.

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Dietary Supplement Mood, Relaxation, Sleep The essential amino acid L-tryptophan helps support relaxation, restful sleep, and positive mood. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response and sleep/wake cycles. L-Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L-tryptophan converts to niacin in the body, which supports circulation, a healthy nervous system, the metabolism of food, and the production of hydrochloric acid for the digestive system. Source Naturals L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality.

Customer reviews

5.0
verified purchase
L-Tryptophan

L-Tryptophan, 500 mg is a highly effective supplement for supporting sleep, mood, and overall mental well-being. It is made with high-quality ingredients, is easy to use, and offers noticeable results for those struggling with stress or sleep disturbances. The packaging is practical and designed to protect the capsules from light and moisture.

11/6/2024
5.0
verified purchase
Puts me into a deep sleep

When I'm struggling to fall asleep and don't have cheese in the house (another source of tryptophan), I turn to one capsule of tryptophan in the late afternoon or evenings. I often have very deep uninterrupted sleep that night. Sometimes some intense dreams as well. No taste that I can recognize.

4/26/2024
5.0
verified purchase
Great amino acid to try for irritability, anxiety and sleep

Tryptophan is an essential amino acid, meaning the body cannot produce it and it must be obtained through diet. It is a precursor to several vital compounds, and its benefits stem from its role in creating these molecules, which impact various bodily functions. Tryptophan is essential for the body to produce serotonin, a key neurotransmitter that helps regulate mood, appetite, and emotional balance. Adequate intake is associated with reduced irritability, anxiety, and symptoms of depression. This has been a regular for my teen.

12/29/2025
5.0
verified purchase
Great! My Natural Sleep and Mood Aid

This is a lifesaver for winding down at night. I fall asleep more easily and wake up feeling rested. I also feel a subtle but pleasant improvement in my overall mood. Highly effective and gentle.

11/27/2025
5.0
verified purchase
Excellent Source Naturals, L-Tryptophan, 500 mg, 120 Capsules – a safe and high-quality product!

I'm a regular iHerb customer, and my purchases have always been exceptionally satisfying. The product is excellent quality and size. I take one tablet a day as a preventative measure, and the package lasts a long time. The tablets are a convenient size. It's tasteless. I liked the detailed product description and the fast delivery. Excellent Source Naturals, L-Tryptophan, 500 mg, 120 Capsules – a safe and high-quality product!

11/24/2025
5.0
verified purchase
Helps relaxation and sleep naturally

This L-Tryptophan helps me unwind in the evening and improves sleep quality. I feel more positive and less anxious during the day. Capsules are well dosed and gentle on the stomach.

11/11/2025
5.0
verified purchase
EXCELLENT

quality benefit ingredient fiber quality benefit ingredient fiber package size benefit age gut diet taste composition quality benefit ingredient fiber quality benefit ingredient fiber package size benefit age gut diet taste composition quality benefit ingredient fiber quality benefit ingredient fiber package size benefit age gut diet taste composition quality benefit ingredient fiber quality benefit ingredient fiber package size benefit age gut diet taste composition

11/4/2025
5.0
verified purchase

I've struggled with occasional sleeplessness for years, and this L-Tryptophan has been a gentle and effective solution. I take one capsule about 30 minutes before bed, and it helps quiet my mind without making me feel groggy the next morning. I've also noticed that my overall mood feels more balanced since I started taking it. It's a simple, natural supplement that has significantly improved my sleep quality and well-being.

10/21/2025
5.0
verified purchase
For relaxation

I really liked the quality of the supplement and cost. The benefit of Tryptophan is to increase relax function. I recommend the supplement to my family and friends.

10/5/2025
5.0
verified purchase
Прекрасно!

Thank you very much for this product, it suited me, I like the packaging, comfortable and stylish, I will order more of these products, and recommend them to all my friends and relatives! good!!

9/26/2025