Zein Pharma – L-Tryptophan
High-purity tryptophan from natural, plant-based fermentation
Best vital substance of premium quality
100% vegan, certified with the vegan certification mark
The essential amino acid tryptophan serves as a precursor of the so-called “happiness hormone” serotonin, which together with melatonin is responsible for our sleep-wake rhythm, amongst other things.