PMID 12499345
It may be a little longer for people in the Fitzpatrick skin tone 5 area, though, usually taking between four and six months

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Muroski et al., 2008)
But those doses are typically around 600-1,200mg, more than 1,000 times stronger than the 400mcg of lithium used here.86 Revive is one of a few companies using lithium microdoses as a way to improve cognition, balance mood, and even promote longevity