GW501516, often referred to as Cardarine, is a compound sometimes classified with SARMs.It’s known for its potential benefits in endurance and fat loss by activating the PPARδ receptor, which plays a role in energy metabolism.

LGD-4033, commonly known as Ligandrol, is a popular SARM (Selective Androgen Receptor Modulator) that is often used for muscle building and fat loss. It works by selectively binding to androgen receptors in muscle and bone tissue, which can promote anabolic (muscle-building) effects while minimizing side effects commonly associated with anabolic steroids.

MK-677, often referred to as Ibutamoren, is not a SARM (Selective Androgen Receptor Modulator) but a growth hormone secretagogue. It mimics the action of ghrelin, a hormone that stimulates appetite and promotes growth hormone release.

OSTA, or Ostarine (MK-2866), is one of the most well-known SARMs (Selective Androgen Receptor Modulators). It’s primarily researched for its potential to promote muscle growth and improve lean body mass.

"Pro Gain" is not a widely recognized term specifically associated with SARMs, but it may refer to a brand or product that includes a combination of compounds, potentially including SARMs or other performance-enhancing substances aimed at muscle gain.

"Pro Lean" typically refers to a supplement or product aimed at promoting fat loss while preserving lean muscle mass. It may include SARMs or other ingredients designed for weight management and body composition improvements.

S4, also known as Andarine, is a selective androgen receptor modulator (SARM) that has gained popularity for its potential benefits in muscle building and fat loss.

"Testo SARMs" typically refers to compounds that might be marketed as enhancing testosterone levels or mimicking some of the anabolic effects of testosterone, often in the context of muscle building or performance enhancement.

YK-11 is a compound often categorized as a SARM (Selective Androgen Receptor Modulator), but it actually functions more like a myostatin inhibitor. Myostatin is a protein that limits muscle growth, so inhibiting it could potentially lead to increased muscle mass.