Primobol is a good base compound in a stack and can produce results just slightly below that of Nandrolone and is best used in a cutting stack, because Primo does not aromatize. Primobol is the injectable version of the steroid Methenolone. It is the same compound as the one in Primo Orals (Methenolone acetate), both produced by Schering. In this injectable version, an Enanthate ester is added to the steroid, which makes for a slow and gradual release from the site of injection. Its length of activity would thus be quite similar to Testosterone Enanthate, with blood levels remaining elevated for approximately two weeks. Methenolone itself is a long acting anabolic, with extremely low androgenic properties. Its anabolic effect is also quite mild; its potency is considered to be slightly less than Nandrolone Decanoate on a milligram for milligram basis. For this reason, Primobol is most commonly used during cutting cycles when a mass increase is not the main goal. Some athletes do prefer to combine a mild anabolic like Primo with bulking drugs such as Dianabol, Anadrol, or testosterone however, presumably to lower the overall androgen dosage and minimize uncomfortable side effects. Primobol has a release time of between 10-13 days. It is typically injected every day. Dosages are around 50-100mg per day.