HealthyHey Nutrition Naturally Derived Caffeine and L Theanine Capsule is a Health Supplement that is primarily used for the treatment of Fatigue, Muscle Weakness, Joint Pain, Skin Disorders and Diseases, High Blood Pressure. The key ingredients of HealthyHey Nutrition Naturally Derived Caffeine and L Theanine Capsule are Caffeine, L-Theanine. The properties of which have been shared below. The correct dosage of HealthyHey Nutrition Naturally Derived Caffeine and L Theanine Capsule depends on the patient's age, gender, and medical history. This information has been provided in detail in the dosage section.