It's a supplement: Lumiday is a food supplement, not a pharmaceutical medication that has controlled research studies that can reliably answer your question. Lumiday contains multiple components including st. Johns wort, theanine, 5htp, rhodiola, and b vitamins -- all in an expensive proprietary mix. I'm sorry, but your guess about "how long" it will take is as good as anyone else's.
Answered 12/30/2014
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