The evidence on GLP-1 side effects is stacking up — and separating myth from medicine is getting harder. This week brought two major developments: researchers flagged a possible link between the drugs and hair loss, while Australia's medicines regulator warned of a "rare but severe" eye disorder linked to Ozempic, Wegovy, and Mounjaro. The Guardian's science correspondent Nicola Davis has sifted the claims to see what holds up.

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Weight-loss jabs work...