GLP-1 receptor weight loss drugs like Zepbound and Wegovy dominate the market, but alternatives are emerging. Zealand Pharma's petrelintide, targeting amylin and calcitonin receptors, could offer advantages over GLP-1 drugs. BioAge Labs' azelaprag, targeting the APJ receptor, aims to enhance GLP-1 drugs' efficacy while mitigating side effects. Both companies present potential investment opportunities in the growing weight loss market.