There are many things we have yet to discover about melanin, as the references attached to this article will indicate.
Melanin, according to the ancients’ view, is to bio-photons, what blood is to oxygen, and other gasses. And, just as with blood, melanin both circulates to deposit, and uptake bio-photons to the rest of the body, including the critical part of it all, our brains.
Without going into the vast amount of details possible, suffice it to say that melanin picks up light, both photonic light from sources external to the body, as well as bio-photonic light from inside the body. Each have separate, and individuated uses. Much of the sorting, and managing of the light is done in the brain via the complex of neural fibers that connect to the pineal gland.
It is one of my further conclusions that melanin will be affected by the galactic center emanations, if only because of the huge amount of suns located there. Presumably kicking up photonic activity, which produces bio-photonic activity. This provides the mechanism for the observed effects of the Yugas on humanity, and our history, and progress.
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The Invaders clearly knew that our usefulness to them stemmed from our inherent psychic abilities arising from neuromelanin, and circulating melanin, as well as our pliable genetics.