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Nandrolone Data (including joint pain relief mechanism(s))
Author: Type-IIx
19-nortestosterone; 19-nor-4-androsten-17β-ol-3-one; 17β-hydroxyestr-4-en-3-one; Nandrolone; Deca; NPP
Removal of the methyl group at C-19 yields a product that is 20% as susceptible to aromatization as T (Vida (227)). Its C-4,5 double bond does render it susceptible to 5α-reduction, however, its 5α-reduced product, dihydronandrolone (DHN) is a weak AR ligand, thus its action in prostrate, scalp is relatively weakened. [1]
Unlike Trenbolone, Nandrolone has no effect on GR number (glucocorticoid receptor expression) in rat muscle (40). [2]
Erythropoiesis
Markedly augments erythropoiesis (>Oxymetholone) [3] (decanoate > phenylpropionate)
Bloodwork
600mg Deca only:
Source: withheld; off-site reference
Potency for muscle anabolism
[4] 200mg 8 weeks ND yielded +2.6 kg FFM
[5] 300mg ND vs. 300mg TE * 6 weeks, skinfold caliper measures, insignificant between-group differences (n=8 or 9)
(consider inaccuracies inherent to caliper use and inter- subject & inter- & intra- practitioner variation in measurement technique; small group sizes & high likelihood of type II error [statistics])
Psychological effects of Nandrolone
* Serum homovanillic acid (HVA) changed significantly in ND 100 mg weekly (+17.6 ± 7.7 pmol/L) and ND 300 mg weekly (+11.0 ± 3.3 pmol/L) but not in TE 100mg nor TE 300mg groups. That is, even therapeutic/replacement doses of nandrolone produced significant changes in dopamine metabolism.
Dopamine metabolism changed by nandrolone but not by testosterone... could have originated from both intra- and extra- cerebral sources. The difference in effect may reside in differences in the biologically active metabolites, but high TE (300mg) producing by far the greatest change in estrogen concentration while not producing any change in HVA argues against a role for estrogen alone in dopaminergic activity of androgens. [7]
- The proposed dynamic interaction of changing concentrations of estrogen metabolites with ND (half-life, 8 days) and its metabolite DHN may be implicated in changes in the number of dopamine receptors that are dependent on the timing of exposure to estrogens and on the presence of other steroid hormones (Hruska, 1980; Fernandez-Ruiz, et al., 1989) [7].
Aromatization
After 6 weeks, serum E₂ was reduced to 11 ± 9 pg/mL (100mg ND) and 14 ± 4 pg/mL (200mg ND) [7]
Molecular modeling of predicted activity
Swiss Target Prediction:
Pharmacokinetics & Pharmacodynamics
NPP (nandrolone phenylpropionate; Durabolin [sans Deca]): duration of activity of 10 days vs. Deca-Durabolin's duration of activity of 21-28 days. The phenylpropionate ester is characterized by a relative molecular weight of 1.46 & relative parent hormone content of 0.69 (comparable to cypionate & enanthate).
HPG axis suppression
- Testosterone suppression: complete suppression between 5-10 days with a single 100mg bolus:
- "Plasma testosterone concentrations were most rapidly and completely suppressed within the first week after injections of the phenylpropionate ester, but this suppression was sustained for the shortest time. The duration of suppression was significantly longest after the gluteal 1-ml injection. Plasma testosterone concentrations returned to base line by day 13 after the phenylpropionate ester but required >20 days to return to base-line levels after the decanoate ester." [10]
- FSH suppression occurred rapidly (day 3 or 4) but returned to base-line practically immediately after phenylpropionate (IM gluteal) and after about a week with decanoate (Table 6, Inhibin, p. 100) [10]
Author: Type-IIx
19-nortestosterone; 19-nor-4-androsten-17β-ol-3-one; 17β-hydroxyestr-4-en-3-one; Nandrolone; Deca; NPP
Removal of the methyl group at C-19 yields a product that is 20% as susceptible to aromatization as T (Vida (227)). Its C-4,5 double bond does render it susceptible to 5α-reduction, however, its 5α-reduced product, dihydronandrolone (DHN) is a weak AR ligand, thus its action in prostrate, scalp is relatively weakened. [1]
Unlike Trenbolone, Nandrolone has no effect on GR number (glucocorticoid receptor expression) in rat muscle (40). [2]
Erythropoiesis
Markedly augments erythropoiesis (>Oxymetholone) [3] (decanoate > phenylpropionate)
Bloodwork
600mg Deca only:
E2 8.1 pg/mL (low-normal)
IGF-I 327 µg/L (high)
Source: withheld; off-site reference
Potency for muscle anabolism
[4] 200mg 8 weeks ND yielded +2.6 kg FFM
[5] 300mg ND vs. 300mg TE * 6 weeks, skinfold caliper measures, insignificant between-group differences (n=8 or 9)
(consider inaccuracies inherent to caliper use and inter- subject & inter- & intra- practitioner variation in measurement technique; small group sizes & high likelihood of type II error [statistics])
Psychological effects of Nandrolone
[7]Hannan et al. (1988) have examined plasma homovanillic acid changes following 6 weekly intramuscular injections of 100 or 300mg of testosterone enanthate or nandrolone decanoate administration in 25 males and found significant increases in homovanillic acid for both of the nandrolone but neither of the testosterone treatments. Since a large proportion of plasma homovanillic acid originates from CNS metabolism of dopamine, the demonstrated change associated with nandrolone administration confirms an anabolic-androgenic steroid-induced alteration in CNS neurotransmitter metabolism and suggests a mechanism to explain reported altered behaviour in some anabolic-androgenic steroid users. Interestingly in this regard the deletion of the 19-methyl group in nandrolone produces a more planar steroid than testosterone that thus, like 5α-dihydrotestosterone, has altered receptor binding affinities, as well as unique metabolites. It must be added that estrogens are also known to alter central nervous system neurotransmitters through inhibition of monamine oxidase activity, so aromatisation of testosterone to estrogen could also play a role (Klaiber 1972).
[6]
* Serum homovanillic acid (HVA) changed significantly in ND 100 mg weekly (+17.6 ± 7.7 pmol/L) and ND 300 mg weekly (+11.0 ± 3.3 pmol/L) but not in TE 100mg nor TE 300mg groups. That is, even therapeutic/replacement doses of nandrolone produced significant changes in dopamine metabolism.
Dopamine metabolism changed by nandrolone but not by testosterone... could have originated from both intra- and extra- cerebral sources. The difference in effect may reside in differences in the biologically active metabolites, but high TE (300mg) producing by far the greatest change in estrogen concentration while not producing any change in HVA argues against a role for estrogen alone in dopaminergic activity of androgens. [7]
- The proposed dynamic interaction of changing concentrations of estrogen metabolites with ND (half-life, 8 days) and its metabolite DHN may be implicated in changes in the number of dopamine receptors that are dependent on the timing of exposure to estrogens and on the presence of other steroid hormones (Hruska, 1980; Fernandez-Ruiz, et al., 1989) [7].
Aromatization
After 6 weeks, serum E₂ was reduced to 11 ± 9 pg/mL (100mg ND) and 14 ± 4 pg/mL (200mg ND) [7]
Molecular modeling of predicted activity
Swiss Target Prediction:
Pharmacokinetics & Pharmacodynamics
NPP (nandrolone phenylpropionate; Durabolin [sans Deca]): duration of activity of 10 days vs. Deca-Durabolin's duration of activity of 21-28 days. The phenylpropionate ester is characterized by a relative molecular weight of 1.46 & relative parent hormone content of 0.69 (comparable to cypionate & enanthate).
HPG axis suppression
- Testosterone suppression: complete suppression between 5-10 days with a single 100mg bolus:
- "Plasma testosterone concentrations were most rapidly and completely suppressed within the first week after injections of the phenylpropionate ester, but this suppression was sustained for the shortest time. The duration of suppression was significantly longest after the gluteal 1-ml injection. Plasma testosterone concentrations returned to base line by day 13 after the phenylpropionate ester but required >20 days to return to base-line levels after the decanoate ester." [10]
- FSH suppression occurred rapidly (day 3 or 4) but returned to base-line practically immediately after phenylpropionate (IM gluteal) and after about a week with decanoate (Table 6, Inhibin, p. 100) [10]