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The longer estimate (30 days) represents the outer limit
The deep orange hydrocarbon carotene is widely distributed in plants, but is not sufficiently stable to be used as permanent pigment, other than for food coloring
GHK-Cu (glycyl-L-histidyl-L-lysine bound to copper(II)) has been used for decades in low-concentration topical cosmetics with a generally favorable tolerability record, but there is almost no published human adverse-event data especially for injectable or systemic research use
It is supplied for laboratory research only
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