Influencers and athletes are among those claiming substances can help with injury repair, weight loss and angi-ageing

• Medicines watchdog to investigate UK peptide clinics over health claims

From influencers to athletes, high-profile figures are hailing peptides as the route to wellness, claiming they help with injury repair, weight loss, anti-ageing and mood. We take a look at what these substances are, and the murky industry surrounding them.