Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| hCG (Human Chorionic Gonadotropin) | Nandrolone (Deca-Durabolin) | |
|---|---|---|
| Category | Hormones | Hormones |
| Standard Dose | Research indicates 250-500 IU administered subcutaneously 2-3 times per week as a TRT adjunct for fertility and testicular maintenance. | Research indicates 50-200 mg administered via intramuscular injection every 7-14 days for joint/collagen therapeutic protocols. |
| Timing | Administer on non-testosterone injection days if using twice-weekly TRT split. Consistent schedule (e.g., Tuesday/Saturday). Refrigerate reconstituted solution; use within 30-60 days. | Inject on the same day as testosterone for convenience. Deep intramuscular injection in gluteal or deltoid muscle. Full collagen synthesis benefits require 8-12 weeks minimum. |
| Cycle Duration | Ongoing for as long as TRT continues and fertility preservation is desired. Can be used in 4-8 week pre-PCT bursts to 'prime' testicular recovery. | 12-16 week cycles for joint/collagen repair. Some clinical protocols extend to 6 months under medical supervision. |
| Evidence Level | strong_human | moderate_human |
hCG mimics luteinizing hormone (LH) by binding the LH/CG receptor on testicular Leydig cells, activating the cAMP-PKA signaling cascade that upregulates steroidogenic acute regulatory protein (StAR) and CYP11A1, driving cholesterol conversion to pregnenolone and downstream testosterone synthesis. By maintaining intratesticular testosterone (ITT) levels during exogenous testosterone administration, hCG preserves Leydig cell function, spermatogenesis, testicular volume, and the production of neurosteroids (pregnenolone, DHEA) and estradiol within the testes.
Research indicates 250-500 IU administered subcutaneously 2-3 times per week as a TRT adjunct for fertility and testicular maintenance.
Administer on non-testosterone injection days if using twice-weekly TRT split. Consistent schedule (e.g., Tuesday/Saturday). Refrigerate reconstituted solution; use within 30-60 days.
Ongoing for as long as TRT continues and fertility preservation is desired. Can be used in 4-8 week pre-PCT bursts to 'prime' testicular recovery.
Nandrolone decanoate is a 19-nortestosterone derivative that binds the androgen receptor with high affinity but undergoes 5-alpha reduction to dihydronandrolone (DHN), a weaker androgen than DHT, resulting in reduced androgenic side effects. It stimulates collagen synthesis via upregulation of prolyl 4-hydroxylase and galactosylhydroxylysyl glucosyltransferase, increasing type III collagen production in tendons, ligaments, and joint capsules. Nandrolone also increases synovial fluid production and glycosaminoglycan content, and stimulates bone mineral density through direct osteoblast AR activation and IGF-1 modulation.
Research indicates 50-200 mg administered via intramuscular injection every 7-14 days for joint/collagen therapeutic protocols.
Inject on the same day as testosterone for convenience. Deep intramuscular injection in gluteal or deltoid muscle. Full collagen synthesis benefits require 8-12 weeks minimum.
12-16 week cycles for joint/collagen repair. Some clinical protocols extend to 6 months under medical supervision.
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