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SAMS:Also known as "selective androgen receptor modulator", and the principle of SAMS is to grab the corresponding androgen for the muscle and male sex organs. These contact are androgen receptors. The function of steroids is to make the androgen index in the blood pull up very high, so that androgen receptors can grab androgen at will in the blood.And what SAMS does is make these thixotropic mutations more sensitive, so that they can grab more androgens from the blood, so that they can supplement the muscle.