SARMs is short for Selective Androgen Receptor Modulators.
SARMs stimulate the body to generate more of the hormones you already produce, rather than disrupting your body’s natural output to the degree steroids do. For example they will signal tissues like muscle and ligaments to grow but not others such as the prostate, brain and liver.
SARMs also don’t convert into unwanted metabolites such as DHT and estrogen as readily. SARMs do not suppress natural testosterone levels to the same extent as steroids depending on the substance, dosage, duration of use, and the individuals biochemistry, which makes better gains possible with faster recovery time with less disturbance to the endocrine system.
However, aromatase inhibitors and post cycle therapy may be prudent depending on circumstances, please consult a physician before use.