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The results showed that Tretinoin increased the thickness of the skin (more collagen fibres), and decreased the melanin pigment (less pigmentation, another key feature of ageing skin is uneven pigmentation).
Not only that, but the results were dose-dependent. In other words, the stronger the dose of Tretinoin, the more anti-ageing effect that was seen.
This is a very powerful proof that Tretinoin really does have an anti-ageing effect.