Brand. NOW is reasonably priced and always good quality.
Doctor's Best is a good brand too.
You need adequate B6 to work with tryptophan to make serotonin.
It is best taken at bedtime on an empty stomach.
If you take it with food, the other amino acids in the food will compete for tryptophan at the blood brain barrier and less will pass into the brain.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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