Although there are well over 100 antibiotics, the majority come from only a few types of drugs. These are the main classes of antibiotics. Penicillins such as penicillin and amoxicillin. Cephalosporins such as cephalexin (Keflex) Macrolides such as erythromycin (E-Mycin), clarithromycin (Biaxin), and azithromycin (Zithromax)
The endogenous serum metabolite of vitamin D (calcitriol, 1,25(OH)2 D3) is considered a true steroid hormone (D hormone), and like glucocorticoids (GCs) and gonadal hormones, may exert several immunomodulatory activities.itamin D, steroid hormones, and autoimmunity. Cutolo M(1), Paolino S, Sulli A, Smith V, Pizzorni C, Seriolo B. Author information: (1)Research Laboratories and Academic Division of Clinical Rheumatology, Department of Internal Medicine, University of Genova, Genova, Italy.
1 Creatine. 2  Creatine is a naturally occurring compound in the body that's also sold as an over-the-counter supplement. 3  It's used to improve performance during high-intensity bursts of activity and increase muscle mass and strength. 4  Anabolic steroids. Anabolic steroids are synthetic versions of the hormone testosterone, used to build muscle and increase strength. 2  Steroid precursors. 3  Steroid precursors, such as androstenedione (andro) and dehydroepiandrosterone (DHEA), are substances that the body converts into anabolic steroids.