people have been referring to forskolin increasing melanin. I might have found an interesting article on that:
It looks like an eyelash serum formula increases the pigmentation of the follicles:

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I think this could be promising to see what ingredients help to penetrate. Of course a small eyelash tool is not big enough ( and I read as forskolin is only one of the many ingredients, the effect will be even greater with a higher dose) for those wanting to darken their hair/skin

But it would be interesting to look into the ingredients to help formulating our own melanin lotion ( many of those ingredients have nothing to do with penetration, so we can skip them) or we could add something like liposomes?

PS: here’s a pubmed article the lady is probably referring to:
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