Cough syrup Pei Pa Koa maker enters healthy ageing space with NMN product 26-Mar-2024 By Tingmin Koe Nin Jiom, the Hong Kong-based company known for its cough syrup product Pei Pa Koa, is venturing into the healthy ageing supplement space with a NMN (nicotinamide mononucleotide) product set to launch in Singapore.