Hmmm, not sure I buy this. These blood serum tests are always a bit sketchy because of preferential tissue accumulation, half-lives, different GI circumstances (empty stomach, full stomach, other things taken at the same time) and whatnot which are hard to correctly control for.
You always have to be careful of placebo effects on "I feel better" or "I have more energy" but some things, like reduced pigmentation, are harder to fool yourself on.
Liposomal glutathione might be better, but I'd file this under "needs a lot more study."
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