Deca 300mg (Nandrolone Decanoate) is one of the most popular and extensively used anabolic steroids in both medical and athletic circles. Originally developed for treating conditions like muscle wasting and osteoporosis, Deca has become a staple in bodybuilding for its ability to promote lean muscle mass, enhance nitrogen retention, and improve collagen synthesis and bone density. Its reputation for easing joint discomfort makes it a common addition to heavy training cycles.
Due to its decanoate ester, Deca is very long-acting, requiring less frequent injections than shorter esters like NPP. However, its long half-life also means it remains detectable for months, making it unsuitable for tested athletes. Users often report smoother gains and reduced muscle soreness, making it a favorite for off-season mass-building.
Benefits
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Significant increase in muscle mass and strength
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Promotes joint health and relieves joint pain
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Enhances recovery and endurance
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Boosts nitrogen retention and protein synthesis
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Improves collagen production and bone strength
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Mild on the liver and heart compared to many orals
Side effects
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Testosterone suppression (mandatory to stack with testosterone)
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Water retention and bloating
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Acne, oily skin, and hair loss in predisposed individuals
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Potential increase in prolactin levels (may require cabergoline or similar)
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Gynecomastia if estrogen levels are not managed
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Sexual dysfunction when used without a testosterone base
Dosages & Protocol
For Men
Beginner: 300mg per week (1ml weekly)
Intermediate: 400–500mg per week (1.3–1.6ml weekly)
Advanced: 600mg per week (2ml weekly)
Cycle length: 12–16 weeks
Always used with a testosterone base to prevent suppression-related side effects.
Not recommended for women due to high chance of virilization.
How to administer
Administering Deca 300mg intramuscularly requires proper technique and hygiene to ensure safety and absorption.
Gather Supplies:
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Deca 300mg vial
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1ml syringe
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Two needles (one for drawing, one for injecting) – 23–25 gauge
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Alcohol swabs
Prepare the Injection Site:
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Wash hands with soap and water
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Choose an intramuscular injection site (glute or upper thigh)
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Clean the site with an alcohol swab
Prepare the Syringe:
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Attach drawing needle
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Draw the appropriate amount of oil (e.g., 1ml = 300mg)
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Swap to a fresh sterile needle
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Tap syringe to remove air bubbles, push out excess air
Administer the Injection:
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Insert needle at a 90° angle into the muscle
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Inject the oil slowly and steadily
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Withdraw the needle, apply pressure with a swab
Post-Injection Care:
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Massage the area gently
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Dispose of all used materials in a sharps bin
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Monitor for swelling, pain, or redness
Storage
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Store in a cool, dry place between 15–25°C
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Protect from light and moisture
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Keep vial upright and sealed when not in use
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Do not freeze
Half-life & detectability
Half-life: Approximately 6–12 days
Detection time: Up to 18 months in advanced drug testing
For athletes subject to drug testing, it is crucial to consider these detection times to avoid positive tests for banned substances.
