The active ingredient in Andro400 is a natural herb called Eurycoma Longifola which is grown in the rain-forests of Malaysia and Indonesia. It’s been used safely and effectively for 100’s of years to increase libido and boost testosterone in both men and women. Our higher strength product, Andro400 Max, also includes 2 amino acids (l-arginine and l-citrulline) which increase blood flow throughout the body and support healthy blood pressure and weight loss.