Nandrolone Phenylpropionate (NPP) is a short-acting injectable anabolic-androgenic steroid derived from testosterone. Structurally classified as a 19-nor compound, NPP offers enhanced anabolic properties with significantly reduced androgenic effects compared to standard testosterone.
Due to its phenylpropionate ester, NPP is absorbed rapidly and peaks within 24–48 hours after injection. It typically remains active in the body for about 4 to 7 days, making it ideal for athletes who prefer shorter ester cycles or want faster onset of action. To maintain consistent blood levels, it is commonly injected every 2 to 3 days.
NPP is especially valued for its joint-supportive properties, which makes it a popular option among competitive athletes recovering from injury or experiencing joint discomfort. While it has a relatively low androgenic profile, high doses may still result in side effects such as oily skin, acne, hair growth, or voice deepening in men and virilization symptoms in women.
Unlike many oral steroids, NPP is not C-17 alpha alkylated, so liver toxicity is minimal, and long-term use is generally well tolerated under proper medical supervision.
Key Benefits:
Rapid absorption and short-acting ester
Promotes lean muscle gain with minimal water retention
Supports joint recovery and pain relief
Low androgenic impact at therapeutic doses
Minimal liver toxicity
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