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Source Naturals   L-Tryptophan 500 mg - 120 Capsules

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17 Reviews

"L-Tryptophan is a great product. works just as well as the more expensive brand ..."  Read all reviews

Item Number: SN2005
Serving Size: 3 Capsules Servings per Container: 40
Price per Serving:  $0.51 Price per Unit*: $0.17 per Capsule
* Price Per Unit may reflect product's price per capsule, tablet, ounce, fluid ounce, etc.
18 In Stock.

This item will ship on Monday before 5PM EST.

Regular Price:  $31.50 $20.35
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These L-Tryptophan 500 mg 120 Capsules from Source Naturals may help you if you’re having trouble sleeping.

The essential amino acid L-Tryptophan is not produced in the body and must be sourced from a balanced diet. This amino acid is usually found in protein rich foods like red meat‚ yogurt‚ fish‚ milk and more. However‚ modern‚ erratic lifestyles may wreak havoc on our diet‚ which is‚ more often than not‚ incomplete and imbalanced. That’s why this dietary supplement from Source Naturals may be so beneficial‚ it may possibly go a long way in supporting your body’s need for L-Tryptophan.

L-Tryptophan may play an essential part in the synthesis of melatonin as well as serotonin hormones. These hormones can inform our response to stress‚ sleep‚ waking cycles‚ and our mood.

L-Tryptophan 500 mg from Source Naturals‚ when taken regularly‚ may improve certain symptoms of low mood by increasing the production of serotonin in our brains.

Source Naturals’ L-Tryptophan 500 mg may also potentially support your body’s immune function. Some studies state that L-Tryptophan is the precursor to kynurenines‚ which is essential for the regulation of your immune health.

These L-Tryptophan 500 mg 120 capsules from Source Naturals are free of yeast‚ dairy‚ soy‚ egg‚ gluten‚ wheat‚ starch‚ salt‚ preservatives‚ artificial color‚ flavor and fragrances.


These statements have not been evaluated by the Food and Drug Administration (FDA). These products are not meant to diagnose‚ treat or cure any disease or medical condition. Please consult your doctor before starting any exercise or nutritional supplement program or before using these or any product during pregnancy or if you have a serious medical condition.

  • MFG # SN1985
  • UPC # 021078019855
Official Website: http://www.sourcenaturals.com

Serving Size: 3 Capsules
Servings Per Container: 40

Amount Per Serving / % DV

Iron (Naturally Occurring) 600mcg / 3%
L-Tryptophan 1.5g / †

†Daily Value not established.

Other Ingredients: Gelatin (capsule)‚ magnesium stearate‚ silica‚ microcrystalline cellulose and dibasic calcium phosphate.

Contains no yeast‚ dairy‚ egg‚ gluten‚ corn‚ soy‚ wheat‚ sugar‚ starch‚ salt‚ preservatives‚ or artificial color‚ flavor‚ or fragrance.

Non-GMO.

1 capsule three times daily‚ between meals and preferably with fruit juice. To support restful sleep‚ take 3 capsules before bed.

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.

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.

Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children. In case of accidental overdose‚ call a doctor or poison control center immediately.

  • Corn Free
  • Dairy Free
  • Egg Free
  • Gluten Free
  • GMO Free
  • Salt Free
  • Soy Free
  • Starch Free
  • Sugar Free
  • Wheat Free
  • Yeast Free

Ratings and Reviews

Write a Review
  • 4.6
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5 17
  • 17 Reviews
    • Verified Buyer

      Ehhh....

      from Portland OR on 1/02/2021
      Bought this to get help with sleeping, but didn't see much of the difference.
    • Verified Buyer

      Works great!

      from MILROY PA on 7/09/2020
      It took about a week to see the results. I was taking it at different times to see what worked for me. I now take this about 2 hours before heading to bed at night. I does help give me a restful sleep, most of the time. I find with more rest, I am not as anxious about other things, so my mood is much better during the day. All in all a great product.

      Pros

      Even though the capsule is a bigger in size that what I normally take, it is easy to swallow.

      Cons

      I don't get the same results every night.
      review-checkI would recommend this item to a friend.
    • It works

      from Naples, Fl on 5/13/2020
      It works well without causing drowsiness.

      Pros

      Helps sleep.

      Cons

      Nothing.
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Great product, great price

      from Honolulu HI on 10/25/2019
      Good quality product and best price! I like the l-tryptophan from this brand the best. Really helps me sleep and feel better.

      Pros

      Good quality product, great price, and it works!

      Cons

      Nothing
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Great product, best price

      from Honolulu HI on 10/25/2019
      Good quality product and best price! Love this brand's tryptophan. Very effective. Works to help me sleep.

      Pros

      Good quality and great price.

      Cons

      Nothing
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Excellent for going to sleep.

      from Indiana on 11/03/2017
      Love L-Tryptophan 500 mg by Source Naturals! Best thing I've found for getting some shut eye. Too bad more people don't know about it.

      Pros

      No side effects.

      Cons

      Nothing.
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Sleep

      from Lmp. on 1/15/2017
      I use this L-Tryptophan 500 mg by Source Naturals because its natural & it doesn't bother my stomach. When it's a fulll moon, I can't sleep- so I take this with melatonin. It almost always works! It is less expensive at PureFormulas!!

      Pros

      It's natural & not habit forming.

      Cons

      Nothing
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Really great product!

      from CA on 5/21/2016
      I use L-Tryptophan by Source Naturals almost daily. Helps with sleep as well as mood. I prefer this to 5HTP.

      Pros

      Helps with sleep and mood.

      Cons

      Nothing. It's great.
      review-checkI would recommend this item to a friend.
    • Works for me!

      from CA on 2/15/2016
      This is a very high quality L-Tryptophan by Source Naturals that I would recommend to anyone who has trouble sleeping or would like to stop taking prescription/OTC sleep aids. No hangover feeling and works throughout the night. Although a liquid version may work faster, I usually will wake-up a few hours later.

      Pros

      It works and has consistently been high quality!

      Cons

      Nothing.
      review-checkI would recommend this item to a friend.
    • Excellent product!

      from Iowa on 8/24/2015
      I'm sleeping way better now since taking L-Tryptophan by Source Naturals!
      review-checkI would recommend this item to a friend.
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Your question(s) and our corresponding answer(s) will not be confidential and will be posted publically on this specific product page.

Additionally, PureFormulas is unable to directly recommend products in relation to specific health conditions. Please contact your trusted healthcare practitioner for direct product recommendations.

If you have any general questions regarding orders or our policies and programs, please contact our Customer Happiness Team @ 1.800.383.6008

If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use. Your healthcare professional is the best source for guidance before beginning an exercise or nutritional supplement program.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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