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L-Tryptophan Powder

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Price From: FROM $13.96

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L-Tryptophan Powder

Key Features

  • Pure powder
  • Promotes mental wellness
  • Non-GMO
  • Taste

  • Mixability

L-Tryptophan is an essential amino acid, meaning that it must be derived from diet or through supplementation. It is needed in order to produce serotonin.


Serving Size & Timing

This supplement needs to be consumed in servings of 500mg up to three times per day. It should be taken with carbohydrate-rich foods.

Nutritional Information

Supplement Facts

Serving size: 500 milligrams
Serving per container: *
Amount Per Serving % Daily Value**
L-Tryptophan 500mg *
* Daily Value not established.
** Based on 2,000 calorie diet


Sugar, soy, dairy, yeast, gluten, corn and additives.

As a dietary supplement, take 500mg (scant 3/8 tsp) up to three times a day, or as directed by physician.



This vegan-friendly supplement contains no fillers of any kind and is certified food grade. It should be stored in an area free from light, heat and moisture.


Tryptophan is safe as long as suggested serving sizes are adhered to. However, some rarer side effects include gastrointestinal discomfort, vomiting and nausea as well as loss of appetite. Taking too much of it may cause aggravating mental problems including confusion, anger and agitation and restlessness. Those who have been diagnosed with mental conditions such as depression or chronic anxiety should speak with a doctor before use of this supplement, especially if on other medications. Do not take Tryptophan with any other mood-altering drugs. Those who have ever been diagnosed with kidney or liver disease should stay away from amino acid supplementation of any kind until first discussed with a physician.


Due to varying import regulations, not all of our supplements are available to international customers. This product is restricted for sale in the following countries:

  • Australia
  • Austria
  • Germany
  • Italy
  • Netherlands
  • New Zealand
  • Norway
  • Sweden

Customer Reviews

Second Review
Been taking for about a month now and it's still effective at putting me to sleep. Will continue to buy until something stops working.*

On 10/16/2016 Alex said...

I love Tryptophan
Chronic Stress (death of a parent, divorce, etc.) lead to Adrenal Fatigue and severe insomnia problems. Insomnia is so much better now with Tryptophan, Ornithione, Gabe and 5mg's of Melatonin. I fall asleep quickly and stay asleep until the alarm goes off the next day. It has made a tremendous difference in my health to sleep again. Bulk Supplements delivers top quality every time and I will continue to order.*

On 9/29/2016 Rhonda said...

Love it!!
I bought this amino as I have trouble sleeping at night. From broken sleep to trouble getting to sleep. I've been taking it every night for the past t nights and I've noticed a huge difference! I sleep better, more deeply, longer, and get to sleep faster. The increase in sleep quality has definitely helped me maintain my energy throughout the day. *

On 9/25/2016 Matthew said...

Legitimately helps me go to sleep at night, and makes me feel good otherwise.*

On 9/19/2016 Alex said...

A little-known but essential bodybuilding supplement!
I take L-Tryptophan because studies show that it not only increases sleep quality, but also significantly increases the absorption of amino acids in the small intestine. A couple studies even show enhanced endurance and body composition. This is a relatively unknown amino, but a must-have for any athlete/bodybuilder.
By the taste/texture of the powder, i know that this stuff is the real deal.*

On 8/27/2016 Lee said...

Nice for sleep
I take it daily before bed. It does offer a nice calming effect; good for getting to bed on time after a stressful day.*

On 8/11/2016 Tan said...

Great shipping and good quality.
I have noticed deeper sleep achieved when taking this before bed. Always remember never to take protein with any amino acid or else you dilute the effect if the amino acid.*

On 8/5/2016 Paul said...

I have been working with collagen type I and III, and am adding UC-II to the mix. Tryptophan is the missing amino acid in the collagen and this source is by far the least expensive I have found. Currently working with about 1 gram tryptophan to 1 tbsp of collagen. Sleep has been excellent. I'm sourcing several other elements from Bulk Supplements as well and am very pleased with the cost and purity of the items I select.*

On 6/14/2016 Walt said...

How it works
It works really good. When I started to take this product, I sleep better and my mood becomes better. And I like this in a powder. Thank you.*

On 5/27/2016 Maria said...

First Time User
I learned about this product from a dear friend who wanted to help me get a good night sleep. She sent me home with approximately 1/4 of a cup of the product (also from , which worked like a charm to get me to sleep. This was my first purchase after the loaner amount my friend gave me. The product I bought seemed to have worked better than her tryptophan in that I awake without drowsiness on this product, and this product had a fruitier taste than the powder she gave me.

I can take this product and awake refreshed without drowsiness, which I love. The zip bag was messy to open because I did not know that the product would not be sealed below the rip line. I transferred the powder to two jars so that I would not have to bother with the shipping zip bag, which did not seem to seal well. Otherwise, great product for no nonsense sleep support. *

On 4/21/2016 Danielle said...

Wonderful Product
Not there is a lab in my house, but this product seems to wonderfully deliver the intended effect without fillers. We have been using for about a week now, and the consistency has been fantastic. The only downside(which I'm not sure even really qualifies) is that the product zip lock style closure can be a bit tricky. Instead of struggling with it, we just fold over and use a binder clip.
Flavor is great, as noted by all family members who are using this product. I highly recommend.*

On 4/7/2016 Kimberly said...

possible sleep aid?
I received the supplement, but haven't tried it because I am trying to be more methodical about what I am doing, so I can have a better chance of telling what is doing what. Sleep is one of my top problems.

general suggestion: put the name of the supplement on the bottom of the label, because as you fold the bag down you can't see what it is any more.

On 4/2/2016 Lily said...

Works to increase Serotonin
I tried this product and have to say it works similar in effect as 5-HTP. Its not as strong, but definitely does work. This would be good for those who are sensitive to 5-HTP and need something to help them relax but with less side effects. *

On 3/28/2016 Gavin said...

Pure Quality Products,
Now days it is difficult to purchase supplements that contain the main ingredients without a lot of unwanted fillers.
All the products that I have purchased from Bulk Supplements are as pure as pharmaceutical grade, if not better.
I suffer from insomnia for 15 years and tried almost everything I can get my hands on, seen various doctors and have been prescribed strong drugs to no avail.
I have read a great deal on this condition, and found that a combination of L-Tryptophan Powder (3grams) with Motherwort Powder Root (3.5grams) right before I fall asleep on an empty stomach has been a God's sent, and greatly improved my sleeping habits.
Statistically one of five people suffer from some form of insomnia, I hope this information would be helpful to anyone suffering from this condition.
I only purchase natural supplements from Bulk Supplements, in my opinion they are the best you can find anywhere, and great pricing as a bonus. *

On 3/26/2016 Joe said...

Helps keep me level
I love this stuff, I found it to work excellently when I was still on caffeine, and discovered since eliminating caffeine I have to take a lot more to get similar effects. I take it for mood balancing, to prevent anxiety, irritability, and depression. It works great at irritability and depression, and reduces but doesn't eliminate my anxiety, I'm still working on that with dosages and adding in other supplements. I also compared this tryptophan to other brands and they were all inferior in one way or another, side effects and less effective. I won't be trying other brands any more, if it works why mess with it?*

On 3/23/2016 Rachel said...

satisfied customer
good quality...arrived on time...will buy again.*

On 3/23/2016 gordon said...

Great bargain
I love BulkSupplements clean and pure products and that it isn't "made in Chine" which is why I buy my Tryptophan powder from them. Great amount of product in the bag and will likely lasts months.

I notice more energy from Tryptophan so I find it interesting that people use it to sleep. Well I add it to my smoothie in the morning and I'm ready to hit the ground running. I onl take it once a day so far but will probably increase as the weeks progress.

I highly recommend this company and this clean Tryptophan powder.*

On 3/18/2016 Tom said...

I had taken tryptophan back in the day, but I forgot how well it works.
It became unavailable because of a listeriosis scare and I hadn't used it for quite some time.
I slept like a baby; and at my age that's unusual, ha, ha!
Sleep and recovery is part of the equation when it comes to getting results.
Try tryptophan powder and you will NOT be disappointed!
You have my unconditional BRO guarantee!

On 3/14/2016 ANTONIO said...

for sleep
I've been taking this for insomnia. I must say it tastes terrible! I put it into capsules and take 3 g at bedtime nightly along with 3 g l-glycine and some melatonin. Still don't sleep well, but better than if I don't take anything at all. I sure wish it would mix into a drink easily.*

On 2/21/2016 Gertrude said...

I like it
I'm pleased with this product. I just put a scant half teaspoon in my mouth and drink some water and swallow it down. It has a slight bitter taste that's only really noticeable if it takes more than two swallows to get down. The l-Tryptophan has helped improve my mood (less irritable) and helps me sleep through the night. I take it three times a day after meals.*

On 2/15/2016 April said...

Really works!!! : )
I started taking this to ease the effects of SAD which are quite noticeable by mid-December. I'm taking 1000mg at bedtime. I noticed a difference in improved quality of sleep immediately as well as improvement in the depression symptoms.*

On 12/21/2015 JA said...

Great as expected
I use about 3/4 tsp at bedtime with a little carbohydrate and works very well. I appreciate the option to get pure unpolluted supplements at your site. This particular product gives me intestinal gas and bloating no matter what the source or form. I have to take one or two Gas-X with it to relieve that problem.*

On 10/13/2015 jim said...

Helps me sleep and I love the fact that there are no icky fillers from dubious sources.*

On 7/27/2015 melissa said...

wonderful product
I received my order of tryptophan promptly and it was so easy to place the order. i have a busy schedule so it is frequently much easier for me to order online and have supplements shipped. also, since i use a supplements to enhance my well being and health i have found that ordering bulk is the best way to go to adjust dosages and it is the most economic by far.

tryptophan really helps me. i am a long time sufferer of insomnia and this supplement helps me as much as any prescription sleeping pill both with getting to sleep and staying asleep as waking up too frequently and too early have been problematic. whenever possible i like to use supplements rather than prescription drugs.

i have also found that tryptophan increases my energy--maybe because im getting good sleep! it also improves my moods and overall health.

your product is an excellent product. i tend to use or need a little bit higher dosage than whats available by capsules and a bit more than the 1/.8th suggested dosage. the primary reason i use bulk supplements for the ease of being able to adjust my dosages to my unique needs. i just mix the tryptophan with a very small amount of yogurt about an hour before bedtime and i'm off to dreamland. it really works!

thank you for a wonderful service!*

On 7/22/2015 electric said...

Excellent Product Fast Shipping
As always Bulk Supplements is timely with their shipping and the products are grade A. L-tryptophan is also a fantastic product that undergoes many metabolic pathways ie (tryptophan>5-HTP>NAS>Serotonin>Tryptamine or continue on to melatonin)

Also gives you pretty vivid dreams that sometimes may turn into nightmares if taken too close to bed.*

On 6/24/2015 Bryan said...

The missing link
I have been suffering from a low grade feeling of anxiety for a lifetime. I came across a book from Trudy Scott. She recommended several supplements. After taking the questionnaire , i realized that tryptophan might help me. It made a huge difference .A great calm has replaced the anxiety.I feel wonderfully relaxed. It also helps me sleep all night long. I need to take just a little. 1/8 tsp works fine for me.I highly recommend this supplement Thanks*

On 5/16/2015 madison said...

Did not know what to expect - I am not a big turkey eater. One thing I must say about Bulksupps - and that is the information blog annotations for their supplements really is a great time saver and life saver. After reading most of those I had a really big order, I decided to cut it in half and was left with still a pretty big order, and after I got the package and opened it and had my first drink - really regret cutting anything! I was feeling a cold coming on or some terrible malady and after the nice big drink I felt so good and THANKS to the Tryptophan, felt nice and sleepy too, since consuming all their products I feel better - and my sleep is way deeper and filled with dreams - gotta say, totally loving it and can't wait to order more! *

On 5/16/2015 Juan said...

Been using it for many years
This product was excellent quality and works very well for me. I have taken Tryptophan for many years for sleep problems. It quiets down the noise in my head so I can get into a more relaxed state to fall and stay asleep. It actually works best when you take something sweet to raise your insulin level - I prefer a tablespoon of honey. The insulin draws other proteins out of the blood stream, so tryptophan, which is a large amino acid, can have exclusive access to cross the Blood-brain-barrier where it is converted to serotonin. It helps to take it with Vitamin B6 which is needed for the conversion.

I am very happy to have found a great source for this indispensible product.*

On 5/14/2015 Karen said...

Excellent product. It has helped my husband to fall asleep quickly and stay asleep getting a good night sleep.
Am even taking it also for the same reason. *

On 4/21/2015 ANN said...

I purchased L-Tryptophan ten days ago to help my husband sleep better. it worked great the very first night. I am also taking it and I can recommend it. Excellent product *

On 4/21/2015 ANN PRIDE said...

Definitely Induces Drowsiness
It takes between 500-1000 mg on an empty stomach depending on how tired I'm feeling but it helps me feel slightly relaxed and not only helps me get to sleep quicker but also stay asleep during the night.*

On 3/16/2015 Jason said...

so very pleased with the quality of this product and the rapid delivery thanks we are so very happy and will order more in the future.*

On 3/10/2015 earl said...

Sleeping like a rock
Fast shipping, excellent packaging and much cheaper than the capsules. I supplement this to help with insomnia. I'd totally recommend this product to anyone with sleep issues.*

On 3/3/2015 Ray said...

Excellent quality.
I could almost instantly could tell a difference. I had been taking another brand in capsules and it helped but was very expensive. I am so happy I found a place I can buy what makes me feel good at a reasonable price!*

On 2/28/2015 Tawny said...

great sleep aid
Great product that works and you don't have to swallow a pill. Takes awhile to dissolve in water and no after taste. Would recommend this to anyone who has trouble sleeping. *

On 2/23/2015 Dan said...

This by far the cheapest, yet best product I was able to find on the internet. I love this product so much I need to make sure that I do not take to much. There are no fillers and you can see a crystalline glaze in it. THERE IS ABSOLUTELY NO TASTE, WHATSOEVER. Oh yes it is free shipping and on time, what is to dislike?

On 10/26/2014 Nathan said...

I got it fast like I always do. The product does not mix well. But, do not let that stop you . It tasted fine . The great thing about this company is you can tell the stuff is pure . I felt it within a few min it is not the same with when you buy some garbage off the shelf in GNC or other places. Plus it is super cheap and you know your not getting any fillers because you can see it ! I am, and will always order from this company because I do trust them and again super cheap. It did not make me sleep I only took 500mg I am going to try a 1000 tonight *

On 10/5/2014 John John said...

Good Product
This product has relaxing qualities. I would recommend it.*

On 9/30/2014 Kelli said...

clean and effective
Tryptophan is a great sleep aid with no side effects and with this product no fillers of any kind which is why i prefer to order here. more economical this way too.*

On 9/27/2014 Kevin said...

Sleep and Dreams
Bought this for my husband. He has been sleeping super well and having awesome dreams. Very happy!*

On 9/23/2014 SK said...

Ok so I wasn't sure about ordering this product but I did. I ordered it and it arrived very quickly. So I tried it and it works extremely well and I would recommend L-Tryptophan to anyone who needs it. The product is top notch pharm grade and I would definitely order from here again.*

On 7/9/2014 Matt said...

I must say that the order was shipped and received promptly in 3 day on delivery. I only took about 350mg just bed time and awaken fresh in the morning. I will be increase the dosage and see how I feel. At this point I would say that BulkSupplements prices, customer services, delivery and information about their products is above satisfaction.*

On 7/8/2014 melkan said...

I am fortunate to have found BulkSupplements on Amazon. I am amazed with the purity and quality of all the products I have bought.
L-Tryptophan is the latest. I have found everything pure and of top fillers.*

On 5/14/2014 Charis said...

extremely satsfied
This product is great! Pure and does exactly what its meant to do! I took 1gram before bed and awoke refreshed and in great spirits , I really can tell the improvement in seretonin In 24 hrs.*

On 4/19/2014 stephanie said...

really effective. I regularly use this product and would not like to be without it! great price too~*

On 3/11/2014 gena said...

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