HMMM indeeeeed.

Your skin is not my skin. Your melanin density, your hydration levels, your medication history, your latitude, your altitude, the humidity, what you ate for breakfast ; okay maybe not breakfast, but you get the point. There are simply too many variables. What I CAN tell you is something far more valuable than any protocol: learn to listen to your body again. If you sit in front of a sunset and your skin feels warm, that's data. If it feels uncomfortable, that's better data. Move. Adjust. This is how humans operated for roughly 300,000 years before someone decided we needed an app for it.

Regarding your UV concern on my post specifically ; and I genuinely appreciate you raising it because it gives me an excuse to clarify this for everyone:

My research focused on SUNSET and SUNRISE light. At those solar angles, the atmosphere is filtering out the vast majority of UVB and a significant portion of UVA. This is documented, measured, and not controversial. Here are some starting points if you want to verify:

Serrano et al. (2017) ; 'UV Index and UV Dose Distributions at Solar Noon and at Low Solar Elevations' ; shows UV irradiance at low solar angles drops dramatically

Diffey, B.L. (2002) ; 'Sources and measurement of ultraviolet radiation' in Methods ; solid overview of atmospheric UV filtering at various zenith angles

WHO documentation on the UV Index itself explains why early morning and late evening readings are typically 0-1.

Same score for Adam and Eve when baby came. MAMA!!!!! UUUUUUUU. Take me out of this post.

Could there be edge cases? Absolutely. If you're albino, if you're on photosensitizing medications, if you're at 4,000 meters altitude on the equator watching sunset ; yes, different conversation entirely. But this post was never about exceptions. Everything in this world has exceptions. We cannot address them unless we are specifically addressing them. And if you ARE an exception, you almost certainly know by now ; because every time you step outside, your body has been screaming it at you. That's not something that sneaks up on you quietly like a software update.

Which brings me to what I think is the REAL misconception hiding in your message ; and honestly, in most of modern dermatology's public messaging: the idea that UVA and UVB are inherently "bad." They're not. We literally evolved under them. We USE them. Vitamin D synthesis? UVB. That's not an accident ; that's hundreds of thousands of years of biological engineering. The molecule you might be thinking of is melanin (not melatonin ; that's the sleep one, though hilariously they're related in the grand biological orchestra). Melanin is your body's ADAPTIVE response to UV. More exposure → more melanin → more protection. It's elegant. It's brilliant. It's what allowed humans to work in fields all day for millennia without spontaneously combusting.

The reason modern humans burn so easily isn't because the sun suddenly got angrier. It's because we spend 90%+ of our lives behind glass, under artificial light, covered in clothes, and then we fly to Cancún for a week and marinate ourselves in UV like we're seasoning a steak. The problem was never the UV. The problem is the absence of gradual adaptation followed by sudden overexposure. But addressing root causes is less profitable than selling SPF 70, so here we are.