I believe the caveman regimen only works if your acne is not genetic, for me my brother and parents have clear skin and I was the only guy who had acne, so I pretty much concluded that my acne products were the one causing it, especially the oily skin I have which is super excessive. I actually just started the caveman regimen with water atleast once a day for 5 days now, and I'm surprised I haven't broken out yet because of it.

I got 90% clear on the caveman regimen. Then i started using methylene blue products from mitobluefor anti-aging purposed. I like their skin cream the most. I have since got 100% clear. I love science!

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I tried it for 2 months.
My skin got very dry and ultimately I decided to stop as I need to use moisturiser.

I noticed some improvement but I still had regular breakouts.

For me it wasn't a cure but it was nice for a few weeks to not have to bother with a proper skin care routine.