Primo 100 is an injectable steroid which contains the hormone Methenolone Enanthate.
The ester of this compound makes it slow acting, and thus means that injections can be less frequent. Bodybuilders using this steroid often follow a dosage schedule of two or three shots per week.
Methenolone Enanthate (Primobolan, as it is often called), is a very popular steroid amongst bodybuilders who are in the cutting phase of their training and dieting. This steroid is very mild in its nature and seems to work exceptionally well with calorie restricted diets. Methenolone Enanthate will not aromatize in the body, therefore estrogenic side effects such as bloat should not be a concern. Bodybuilders with reasonably low bodyfat will notice an increase in definition and lean muscle mass.
Methenolone Enanthate is also a very popular "bridging" steroid, meaning that bodybuilders sometimes use a steady dose of it in between their regular cycles to keep the body in a more anabolic state than if they were natural, without suppressing their natural hormonal levels as much as utilizing anything Testosterone-based.
Those looking to use Methenolone Enanthate in a cycle might stack it with a low dose of a Testosterone-based compound, and an oral such as Stanozolol or Oxandrolone. Methenolone Enanthate is also a very popular steroid among female bodybuilders where its low androgenic properties and mild nature makes it a very safe choice for them to use. Male bodybuilders often use Methenolone Enanthate in a dose of 300-800mg/week, anywhere from 10-16 weeks, while women find that a dosage 50-100mg/week will generally yield desirable results.