Supplements and statins.
Statins are the most-prescribed class in the UK (atorvastatin alone is dispensed roughly 73 million times a year). Most supplement-statin interactions are mild, but a few are clinically meaningful.
Niacin in pharmacologic doses alongside simvastatin has documented muscle-toxicity risk and is the most-cited statin-supplement red flag (HPS2-THRIVE). Red yeast rice contains monacolin K, which is biochemically identical to lovastatin, so combining it with a prescribed statin is duplicate dosing. CoQ10 is widely used to offset statin-induced myalgia: the mechanism is plausible, the clinical evidence is mixed but tilting positive, and the safety profile is clean.
Something missing?
If a supplement or medication you take isn't in our autocomplete, tell us and we'll add it in the next quarterly update.