Hi & Welcome to HCM. The enlargement of male breasts (gynecomastia) is usually due to hormonal imbalance. Other causes include liver diseases, excessive breast growth, drugs intake like Cimetidine, Spironolactone, Anabolic steroids etc. Had you been my patient I would have requested a complete hormonal assessment before any clinical and treatment decisions could be made. Gynexine contains the natural herbs and used for the treatment of gyenecomastia but it is not appropriate for you to take Gynexin without the opinion of your treating physician or endocrinologist. The most common side effects are: Allergic reaction, dry mouth, stomach upset, etc. Hope to have answered your query. Best regards.