Active substance
L-Tryptophan
2 products from 2 companies contain this in United States.
2 without prescriptionLiquid
Available without a prescription
L-Tryptophan 74234X/59mLWithout prescription Professional Complementary Health Formulas · L-TryptophanTryptophan6X/mLWithout prescription BioActive Nutritional, Inc. · L-Tryptophan
Same substance is not the same product. Strength, form, release mechanism and other ingredients all differ. Whether one can replace another is a decision for a pharmacist.