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Description
The Science of Skin Aging: Why Topicals Arent Enough By your mid-20s, your bodys natural collagen production starts to drop by about 1% each year (NIH)

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doi: 10.1177/0960327110396523

It can actively undermine your entire research protocol

That might mean vitamin D for a deficiency, iron for anemia, omega-3s for cardiovascular health, or probiotics for a digestive condition
Source quality is the number one predictor of results
