L-Tryptophan - TryptoPure®

  • Contains TryptoPure®
  • Ajinomoto AminoScience from Japan
  • Sleep & mood
  • Precursor to serotonin and melatonin
  • 500 mg L-tryptophan per capsule
  • 90 vegetable capsules
Out of stock
EUR 24.75
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L-Tryptophan - TryptoPure® by Doctor's Best

TryptoPure® offers a unique and exceptional pharmaceutical grade L-tryptophan. L-tryptophan is an essential amino acid and an important precursor to a variety of bioactive substances including serotonin. Doctor's Best L-Tryptophan contains TryptoPure® manufactured by Ajinomoto. This L-tryptophan has a very high degree of purity, according to both Japanese and American pharmacopoeia standards. TryptoPure® has for some time been available only to physicians, hospitals and health centers. Today it is also available in supplements.

Essential amino acid TryptoPure®

L-tryptophan is one of the eight essential amino acids. Unlike non-essential amino acids, essential amino acids cannot be synthesized in the human body and must therefore be taken either the dietary or the supplementation way. Bodily tryptophan concentrations are the lowest of all twenty amino acids.


  • Essential amino acid, of pure pharmaceutical quality
  • Precursor of diverse bioactive substances
  • Suitable for vegans and vegetarians
  • Does not contain gluten or soy; GMO-free

L-tryptophan has a precursor function

L-tryptophan plays a role in various metabolic functions throughout the body. It is a precursor to serotonin and melatonin and it can be built into proteins and enzymes. L-Tryptophan has been carefully and extensively researched. Adequate L-tryptophan intake is essential for humans. L-tryptophan is best taken separately from other amino acids and food, for example 2 hours after dinner, before bed.


L-Tryptophan was discovered in 1901 by biochemists Hopkins and Cole. They isolated L-tryptophan from casein protein. L-tryptophan was synthesized more regularly from 1949 onwards, but it was not formally released until the 1980s thanks to fermentation-based production methods. Between 1989 and 2001, the sale of L-tryptophan was banned due to contamination of the raw material and the serious health risks involved. Since this ban was lifted, L-tryptophan has been widely marketed and used as a supplement.

Warning when using medication

Are you taking antidepressants with serotonergic effect, hypnotics with a central depressant effect, or certain medicines for the treatment of migraine, and are you considering taking L-tryptophan? Then consult your doctor first. Tryptophan can enhance the effect of antidepressants and of sleeping pills. Do not combine L-tryptophan with any 5-HTP supplement, St. John's wort or Griffonia.

About Doctor's Best

Doctor's Best is a company producing nutritional supplements based on the latest insights from scientific research into wholesome nutrition. It was founded in 1990 by a physician to further his interest in good nutrition. The Doctor's Best product range now includes over 200 high-quality products. Strictly branded raw materials are used and supplements are thoroughly tested throughout the production process, from raw material to end product. The manufacturing process is fully based on Guidelines for Current Good Manufacturing Practice (cGMP). Ingredients for Doctor's Best products hail from all over the world. To this end, we collaborate with food scientists and all raw materials have been carefully developed and researched. This has resulted in qualitatively superior end products.

Standardized brand products

In its products Doctor's Best almost exclusively uses proprietary and standardized brand materials of official trademarks that have been extensively researched. The authenticity of these ingredients is guaranteed in all products. Doctor's Best never uses alternatives. This results in a qualitatively superior line of supplements with very high bioavailability.

More Information
Product Name
L-Tryptophan - TryptoPure®
Doctors Best
90 capsules
User Instructions

Take 1 capsule daily, or as recommended by a healthcare practitioner. For optimal absorption, separate from protein-containing foods and dietary supplements containing proteins or amino acids.

Ingredients per Serving

500 mg of L-tryptophan (from TryptoPure®).

EU Norm
*RDA = Recommended Daily Allowance
Other Ingredients

Modified cellulose (vegetable capsule), magnesium stearate (vegetable source), microcrystalline cellulose, silicon dioxide.

Vegan, Vegetarian
Storage: see label. Keep out of the reach of children. Consult an expert before use in case of pregnancy, breastfeeding, illness or medication.
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