Peptides, which must be prescribed in Singapore, have become popular among many fitness influencers, trainers and enthusiasts around the world. SINGAPORE: When personal trainer Adrian Tan meets his clients for fitness sessions,  most ask him about peptides in hopes of gaining an extra edge. "I get at least 80 per cent of my clients asking me about peptides and supplementation … Most of the time, it's just to help with the fat loss as well as the muscle gain, and not seeing the results in the