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Swanson Ultra

L-Tryptophan Tryptopure 100% Pure Pharmaceutical Grade

L-Tryptophan Tryptopure 100% Pure Pharmaceutical Grade

Item: SWU372

  • An effective sleep support supplement*



  • 100% pure, pharmaceutical quality from a vegetarian source



  • Promotes healthy serotonin levels*



  • Read L-Tryptophan reviews below!


500 mg 90 Veg Caps
Veg Caps Size: 00

$22.99
MSRP $32.99
Save 30%
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Featured review

"Taking 2 Tryptophan before bed helps me tremendously!! I fall asleep within 30 minutes and sleep all night. When I wake up in the morning, there are no after effects and I'm ready to get up." ~product review by feelingood

See all reviews

Supplement Facts

Serving Size 1 Veggie Capsule

  Amount Per Serving % Daily Value
Ajinomoto TryptoPure® L-Tryptophan (100% pure pharmaceutical grade L-tryptophan) 500 mg *

*Daily Value not established.

Other ingredients: 100% pure vegetable source cellulose (vegetable capsule).

Suggested Use: As a dietary supplement, take one veggie capsule with water 30-60 minutes before sleeping. For maximum benefit, take two veggie capsules.

WARNING: Do not take this product if you are taking a prescription antidepressant or if you are pregnant or nursing. Consult your healthcare provider before use if you have a medical condition or if you are taking any prescription medications.

AjiPure® and TryptoPure® are registered trademarks of Ajinomoto Co., Inc.

Relative Size

Printable Size Guide

Shipping Weight

.19 lbs

  • An effective sleep support supplement*



  • 100% pure, pharmaceutical quality from a vegetarian source



  • Promotes healthy serotonin levels*



  • Read L-Tryptophan reviews below!


It's back, and better than ever! L-Tryptophan is a precursor to serotonin, and it's powerfully effective when used properly. By supporting serotonin levels, L-tryptophan not only helps us fall asleep and stay asleep, but it also promotes mental health and provides dietary support against nervousness and tension.* TryptoPure L-Tryptophan from Swanson Ultra is the purest pharmaceutical-grade tryptophan on the world market. It's produced through a fermentation process from a vegetarian source, using the most precise standards for safety and quality assurance. Want to hear more? Check out our customer-created L-Tryptophan reviews below!

Swanson Ultra L-Tryptophan Tryptopure 100% Pure Pharmaceutical Grade Reviews

Summary of Customer Ratings & Reviews

Customer Ratings & Reviews

L-Tryptophan Tryptopure 100% Pure Pharmaceutical Grade is rated 4.5 out of 5 by 69.
Rated 5 out of 5 by from Love this product! One tablet taken 1 hour or so before I want to retire for the night. The effect is not dramatic but I am aware that "I am ready to go to bed". When I turn out the lights I then take a Swanson dual-release 3mg of Melatonin and within 15 min I am asleep....for the night!
Date published: 2017-05-11
Rated 5 out of 5 by from Good product in more ways than one I really like the way it makes me relax at night after a stressful day at work. I wake up feeling refreshed and in a good mood. When I run out I can really tell
Date published: 2016-04-14
Rated 4 out of 5 by from seems to work Seems to make us sleepy so we can fall asleep/
Date published: 2016-04-02
Rated 5 out of 5 by from Works when nothing else did! This is my first review because it is the first product we use that has shown immediate, positive results. Many of the vitamins and supplements we take are for "insurance" based on research and recommendations from various (real) authorities. This product worked the very first night and each night since. My wife (age 66) had problems getting to sleep at night and this fixed it. She has told me "Get another bottle!"
Date published: 2014-11-22
Rated 3 out of 5 by from No better than regular L-Tryptophan... After the placebo effect wore off, it didn't put me to sleep any faster than the much less expensive regular L-Tryptophan (2X, 1hr before bed).
Date published: 2014-08-23
Rated 4 out of 5 by from tryptophan works best for me when i take 3 and used with time release melatonin
Date published: 2014-06-16
Rated 5 out of 5 by from natural sleep aide this helps me relax so i can more easily drift into sleep
Date published: 2013-09-09
Rated 5 out of 5 by from Helps you relax I take this at bedtime and it helps me relax so I get to sleep quickly. Sometime I use it in the day when I feel stressed but primemarely at night. I recommend it.
Date published: 2013-07-03
Rated 5 out of 5 by from Just What My Body Needed This product has helped me so much in fighting feelings of stress. I also take L-theanine. Everyone's body is different, but these two together are just what my body needed.
Date published: 2013-05-06
Rated 5 out of 5 by from Great sleep aid It's so much easier than making a turkey sandwich at bedtime!
Date published: 2013-04-05
Rated 4 out of 5 by from Good value A quality product for a good price!
Date published: 2013-03-18
Rated 5 out of 5 by from Very natural. L-Tryptophan (2 capsules) helps me fall asleep very naturally, stay asleep longer, and I can get up in the morning without feeling drugged and without any dry-eye symptoms, which I get with melatonin.
Date published: 2012-10-29
Rated 2 out of 5 by from Not sure about this stuff... Well, I've been using L-tryptophan for about 9 days now. I have a lot of trouble sleeping and I have to say this stuff really did help. So why the bad review? Well, in the first few days of taking the supplement, I noticed a cough and just a few days ago, I noticed some hair loss. I don't take any other medications, so I started to do some research on the internet and found that these can in fact be side effects of taking L-tryptophan. Unfortunately, I am going to have to discontinue use...makes me sad, because I actually was finally getting a good nights sleep.
Date published: 2012-07-27
Rated 5 out of 5 by from Couldn't sleep After not being able to sleep and watching that clock hour after hour I decided I had to try something. I order AjiPure L-Tryptophan with the hope that it would put me to sleep like a turkey dinner does. I have been using it for about 2 weeks now and I have had only 1 night that I haven't slept well. Taking AjiPure L-Tryptophan is that only thing that I have done different. I am very happy so far with this product!!!!
Date published: 2012-05-24
Rated 5 out of 5 by from Continuous Sleep Get your tryptophan without eating a turkey sandwich or drinking milk. I was not a good sleeper unless I ate turkey or drank milk because they both contain tryptophan. Now I can take a capsule and sleep good without the disturbances of late-night food or drink.
Date published: 2012-04-14
Rated 5 out of 5 by from Great product. Easy to purchase, always on time.
Date published: 2010-12-27
Rated 5 out of 5 by from great product for the price very effective....over all mood improvement
Date published: 2010-11-02
Rated 5 out of 5 by from Heavenly sleep This L-Tryptophan is very effective in promoting sleep and staying asleep.
Date published: 2010-10-03
Rated 5 out of 5 by from your best product to date I have recommended this L-Tryptophan to many friends and family with great results every time. Much better nights sleep. Gary
Date published: 2010-10-02
Rated 5 out of 5 by from The best!! At times I have a difficult time falling asleep or staying asleep the entire night. Taking 2 Tryptophan before bed helps me tremendously!! I fall asleep within 30 minutes and sleep all night. When I wake up in the morning, there are no after effects and I'm ready to get up. This is by far the best I have tried to help with sleep.
Date published: 2010-09-13
Rated 5 out of 5 by from great for sleeping this product is fabulous for sleep. i take 2 and sleep very well, i only wake up once or twice and go right back to sleep
Date published: 2010-07-24
Rated 5 out of 5 by from Excellent product This has yet to be the best sleeping aid ever. The price is reasonable and this product actually works for me very well. I haven't felt so calm, relaxed in a long time.
Date published: 2010-05-19
Rated 5 out of 5 by from A Must Have in Any Household This additive free, pharmaceutically pure serotonin precursor has made my habit of obsessing over minutiae a thing of the past. Swanson, I can't thank you enough for this exceptionally priced product!
Date published: 2010-05-01
Rated 5 out of 5 by from i love this i have to get up at 300am to go to work and its hard to go to sleep early. this product really helps me to get a good nights sleep. i only take it the nights before i have to go to work the next morning.
Date published: 2010-02-26
Rated 5 out of 5 by from L=tryptophan excellent product. All my family use this on a daily basis.
Date published: 2010-01-26
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500 mg 90 Veg Caps
Veg Caps Size: 00

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For our website and catalog, the MSRP is the "Manufacturer's Suggested Retail Price." The MSRP is understood to mean the price at which a manufacturer will recommend a retailer sell a product for in stores, on the internet, or in catalogs. The MSRP of National brand items are dictated to Swanson by each manufacturer. For Swanson brand items, the MSRP is calculated based on a varying percentage above the product's base price.

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