Rowan Jacobsen

speaker

1,919 appearances 4 recordings 4 series first heard Jul 2022 last heard 26 Jun

Rowan Jacobsen’s voice in public audio — every appearance, attributed to the second.

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recordings per month · last 12 months

Recordings per month over the last 12 months — 3 in all, peaking in Jun 2026 with 3.

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The Joe Rogan Experience · #2516 - Rowan Jacobsen · 18 Jun 2026 podcast

So it's made by our melanocytes, which are what can become melanoma if they get screwed up.

And those are in the very bottom of the epidermis, the outer layer of the skin.

And it's an incredibly good absorber of UV, better than anything we've come up with.

It's almost perfect at it.

But when your skin gets hit with sunlight, that melanin that's just been produced is at the bottom of the epidermis where the melanocytes are.

So it has to migrate to the surface, and then it kind of acts like

like little umbrellas.

It'll cover the nucleus of the cell and protect it.

So you get these little umbrellas, a line of umbrellas on the very top of your epidermis.

But it has to migrate up because of sunlight.

If melanin is lower in your skin, then it's going to absorb all that radiation

farther down, and actually it can cause more free radicals deeper in the skin.

So it starts lower, and it only goes up in response to sunlight.

So if you're never, ever in the sun...

and you suddenly go out and get hit by a bunch of sunlight, your melanin is going to be down too low and can actually create for you.

It can exacerbate the problem.

Yeah.

I don't know because I don't know about this specifically, but you probably – yeah.

You don't want to just be like messing around with melanin.

To the extent that she is.

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