Perimenopause collagen loss is not the same as normal ageing. Women lose approximately 30% of their skin collagen in the first five years after menopause — driven by oestrogen's direct role in signalling fibroblasts to produce collagen, elastin and hyaluronic acid. This is measurable, documented science. Here's the timeline of what's happening, what the evidence actually says about retinoids, HRT and collagen supplements (including the inconvenient funding-source data), and w