100% Customer Satisfaction Guarantee

America's #1 Rated Catalog/Internet Merchant
Based on Customer Satisfaction

Doctor's Best

Best L-Tryptophan Enhanced

Swanson $22.40
Retail $39.99 Save 44%

Unavailable From Manufacturer
Email Me When Available

Add to Favorites

Recently Viewed Items

Look here for an easy way to
navigate to your previously
viewed products.

Unavailable From Manufacturer
500 mg 90 Veg Caps
  • Best L-Tryptophan from Doctor's Best

  • Enhanced with vitamin B-6 and niacinamide

  • Veggie caps

Best L-Trytophan from Doctor's Best is enhanced with vitamin B-6 and niacinamide. Each serving delivers 500 mg L-tryptophan, an essential amino acid in human nutrition. Essential amino acids are not synthesized by the body and must be obtained in the diet. Vitamin B-6 is an essential cofactor in the conversion of tryptophan while niacinamide plays an important role in allowing our body to properly utilize this essential amino acid. Suitable for vegetarians.

Product Label

Supplement Facts

Serving Size 1 Capsule

Servings Per Container 90 servings

  Amount Per Serving %Daily Value
Niacin (as niacinamide) 20 mg 100%
Vitamin B6(from 17.6 mg pyridoxal 5-phosphate) 10 mg 500%
Ajinomoto L-Tryptophan 500 mg

†Daily Value not established.

Other ingredients: Modified cellulose (vegetarian capsule), celllulose, magnesium stearate (vegetable source), silicon dioxide.

Suggested adult use: 1 or 2 capsules daily. For optimum absorption, take separately from protein-containing foods and dietary supplements containing protein or amino acids.

Suitable for vegetarians

Contains Nothing Other Than Listed Ingredients

Terms and Ingredient Definitions

Doctor's Best Best L-Tryptophan Enhanced Reviews

Summary of Customer Ratings & Reviews

Customer Ratings & Reviews

7 Leaf Guarantee

Swanson’s 7-Leaf Guarantee

Earning your trust is our first
and only priority.

Shipping Restrictions

Countries with restrictions on this product:

  • Canada
  • Japan

More information on shipping restrictions

States with restrictions on this product:

  • Alberta
  • British Columbia
  • Manitoba
  • New Brunswick
  • New Foundland
  • Northwest Territory
  • Nova Scotia
  • Nunavut
  • Ontario
  • Prince Edward Island
  • Quebec
  • Saskatchewan
  • Yukon Territory

More information on shipping restrictions

Top of Page