- You earn loyalty credit for every order you place at iHerb!
- Loyalty credit is equal to 5% of the value of your order, excluding shipping charges.
- Your loyalty credit will be applied towards your next order as soon as your current order has shipped.
- Your loyalty credits are valid for up to 60 days from the date of your last purchase.
The length of time for the expiration date or "best used before" date depends on the type of product, as well as the brand.
Perishable items (such as flax oils or certain probiotics) generally have shorter expiration dates. Although our warehouse is fully air-conditioned, these more fragile items are put in cold storage (freezer or refrigeration unit) for maximum freshness.
Our receiving department does its best to verify and then enter the correct expiration dates for all incoming products. However, discrepancies do occur from time to time. This being said, the exceptionally high turnover at iHerb ensures that our inventory is among the freshest in the industry.
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.
1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 capsules before bed.
Gelatin (capsule), silica, magnesium stearate, dibasic calcium phosphate, and microcrystalline cellulose.
Hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.
Store in a cool, dry place.
If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs consult your health care professional before using this product.
| Supplement Facts | ||
| Serving Size: 3 Capsules | ||
| Servings Per Container: 20 | ||
| Amount Per Serving: | % DV | |
| Iron (naturally occurring) | 575 mcg | 3% |
| L-Tryptophan | 1.5 g | † |
| †Daily Value not established. | ||
Verified Purchase
I was depressed for about 1 year and had not medical insurance. I went into my local health food store and asked for something. I have been taking L-Tryptophan 3 xs a day for 2 months now and I can think clearer and am not crying all the time. I can get up in the morning and look forward to a day and go to bed without crying myself to sleep. I recommend this to anyone who needs something for depression.
Posted by 5284557997048891043 on Jul 09, 2017 | Verified Purchase
After suffering from chronic insomnia for 4 months my research led me to this product and it did not disappoint. I practically fell asleep standing up the first time I took it!! I was taking 2 capsules in the afternoon then 3 before bed to build up the serotonin however I have since cut back to 2-3 just before bed. I have to say that it is better than any sleeping tablet. If you have trouble getting to sleep and staying asleep do yourself a favour and purchase this product you will be amazed.
Posted by 5584677917677897499 on May 11, 2017 | Verified Purchase
L-tryptophan is a daily addition to balance CNS and calm nerve pain. It seems to be helpful in calming the burning sensations and generally relaxing the body. My daughter has used this or 5htp for years.
Posted by 5326084346477477445 on Apr 23, 2017 | Verified Purchase
I wanted to try these to see if I slept better. I took three tablets with fruit juice before bed and awoke rather groggy, disorientated and a little dizzy. These symptoms lasted a few hours. I have only tried them once but dare not retry them.
Posted by 5467881029578642891 on Dec 20, 2016 | Verified Purchase
L-Trytophan works for me and Ive tried many things. I do a little combo with melatonin and I actually sleep. Source naturals is a great brand too.
Posted by 5223579135383264901 on Dec 12, 2016 | Verified Purchase
I haven't slept properly and have suffered from Restless Leg Syndrome since my first daughter was born over ten years ago. I was literally at my wits end when I stumbled across some research on the internet in regards to Trytophan and Melatonin being helpful for sleep and I thought, what have I got to lose?! Honestly within a week I noticed a significant difference, I was sleeping ALL NIGHT! I cannot recommend these products enough, they have given me my life back!!
