The Claim

Ketoconazole and CYP27B1 siRNA inhibit UV-induced MMP-1 expression in human keratinocytes by blocking the synthesis of 1α,25-dihydroxyvitamin D3.

Source: UV increases skin-derived 1α,25-dihydroxyvitamin D3 production, leading to MMP-1 expression by altering the balance of vitamin D and cholesterol synthesis from 7-dehydrocholesterol.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
27score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

Ketoconazole and CYP27B1 siRNA reduce the production of MMP-1 protein in human skin cells exposed to UV light by preventing the formation of 1α,25-dihydroxyvitamin D3.

See the scientific wording

Ketoconazole and CYP27B1 siRNA inhibit UV-induced MMP-1 expression in human keratinocytes by blocking 1α,25-dihydroxyvitamin D3 synthesis.

Why this might work

When skin is exposed to UV light, it stops making cholesterol and starts making a form of vitamin D instead. This vitamin D binds to a receptor in skin cells, which turns on a gene that breaks down collagen. Blocking this vitamin D production prevents the collagen breakdown.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: UV increases skin-derived 1α,25-dihydroxyvitamin D3 production, leading to MMP-1 expression by altering the balance of vitamin D and cholesterol synthesis from 7-dehydrocholesterol.

    When skin is exposed to UV light, it makes more of a vitamin D form that triggers a collagen-breaking enzyme. But when scientists blocked that vitamin D production using specific drugs or genetic tools, the enzyme didn’t increase — meaning stopping vitamin D production stops the damage.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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