Page 1 - Reviews - Source Naturals, L-Tryptophan, 90 Tablets - iHerb
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Customer Ratings & Reviews

100% authenticOur products are sourced directly from brands or authorised distributors.Show more
4.6
Based on 227 ratings
180
24
14
7
2
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What customers say
(12)
 
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Rating

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English (UK)
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WIND
Posted on 5/09/2025
61
73
0
44
Tryptophan
Verified Purchase
I have trouble sleeping, so rather than taking sleeping pills, I'm continuing to take natural ingredients like melatonin and tryptophan to improve my sleep quality. The small pill size makes it easy to swallow, and the packaging is neat and tidy. The 1,000 mg tablets seem to be even more effective. Sleep quality affects muscle fatigue and energy levels, so I think this product is effective. I also think this product is of good quality.
Auto-translated from Korean
cb79c3b4-f580-4f26-95f1-74357e5fdb33
iHerbCustomer
Silver
Posted on 12/11/2025
Japan
287
28
0
21
Perfect
Verified Purchase
Excellent quality, amazing ingredients, for daily use and adulthood, perfect composition, does not harm your health, best cost-benefit ratio, practical and safe packaging, the package arrived well packaged, I highly recommend this product for you and your family, I have never tried anything like it and you should too, neutral flavor, blackberry, size, lip, moisturize, dry SPF, aroma, even sensitive skin, no need to worry, use frequently, energy, flushing with niacin, potency effect, nervous system, metabolism, deficiency, supplement, symptom, scalp, protein, diet, training, muscle
Auto-translated from Portuguese
iHerb Customer
Silver
Posted on 10/11/2025
South Korea
202
0
0
18
Lately, I've been having a lot of light sleepers and tossing and turning, so I tried taking a supplement containing tryptophan.
Verified Purchase
Lately, I've been having trouble sleeping and tossing and turning, so I tried a supplement containing tryptophan. After taking it consistently for a few days, I've noticed a noticeable improvement in the quality of my sleep and less early morning awakenings. The capsules are a good size, making them easy to swallow, and the quality is clean, with no odor or unpleasant aftertaste. I take one before bed without any worries, so I've been taking it consistently.
Auto-translated from Korean
Sunee
Silver
Posted on 27/03/2026
Thailand
104
0
0
2
Verified Purchase
This is a good supplement. It's supposed to help me sleep better or not, I'm not so sure. But I have no allergic reaction to it.
Auto-translated from English
iHerb Customer
Posted on 4/11/2025
Brazil
21
0
0
0
Verified Purchase
Excellent additive, good quality, good price and good packaging, I recommend you to buy
Auto-translated from Korean
iHerb Customer
Silver
Posted on 7/09/2025
Saudi Arabia
108
0
0
25
On trial
Verified Purchase
Excellent quality, effective ingredients, sufficient quantity, compact package, useful formula
Auto-translated from Arabic
iHerb-Guru
Gold
Posted on 2/09/2025
Kazakhstan
1,495
170
4
239
Tryptophan
Verified Purchase
My favorite sedative. Improves mood. Reduces melancholy and sadness. A pill of happiness.
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iHerb Customer
Posted on 26/07/2025
Saudi Arabia
93
0
0
60
Verified Purchase
Excellent quality, natural ingredients, sufficient quantity, protein suitable for athletes, tightly sealed package
Auto-translated from Arabic
iHerb Customer
Posted on 7/11/2025
Saudi Arabia
89
0
0
1
Verified Purchase
The quality and ingredients are excellent, and the quantity is excellent compared to the price. Usage: One tablet two hours before bedtime.
Auto-translated from Arabic
iHerb Customer
Posted on 29/06/2026
South Korea
64
0
0
4
I bought this because I heard it helps with sleep.
Verified Purchase
I'm taking it because I heard it helps with sleep.
Auto-translated from Korean