J Nat Prod. 1998 Jan;61(1):119-21. Related Articles, Links
Lignans interfering with 5 alpha-dihydrotestosterone binding to human sex hormone-binding globulin.
Schottner M, Spiteller G, Gansser D.
Lehrstuhl fur organische Chemie, Universitat Bayreuth, Germany.
The natural lignans (-)-3,4-divanillyltetrahydrofuran (1), (-)-matairesinol (2), (-)-secoisolariciresinol (3), (+/-)-enterolactone (4), (+/-)-enterodiol (5), and nordihydroguaiaretic acid (NDGA) (6) reduce the binding of 3H-labeled 5 alpha-dihydrotestosterone (DHT) to human sex hormone-binding globulin (SHBG). (-)-3,4-Divanillyltetrahydrofuran (1) has the highest binding affinity (Ka = 3.2 +/- 1.7 x 10(6)M-1) of all lignans investigated so far; the
reversibility of its binding and a double reciprocal plot suggest a
competitive inhibition of the SHBG-DHT interaction. Increasing hydrophobity in the aliphatic part of the lignans (butane-1,4-diol-butanolide-tetrahydrofuran structures) leads to higher binding affinity. In the aromatic part, a 3-methoxy-4-hydroxy substitution pattern is most effective for binding to SHBG.
PMID: 9461660 [PubMed - indexed for MEDLINE]
Planta Med. 1997 Dec;63(6):529-32. Related Articles, Links
Lignans from the roots of Urtica dioica and their metabolites bind to human sex hormone binding globulin (SHBG).
Schottner M, Gansser D, Spiteller G.
Lehrstuhl Organische Chemie I, Universitat Bayreuth, Germany.
Polar extracts of the stinging nettle (Urtica dioica L.) roots contain the ligans (+)-neoolivil, (-)-secoisolariciresinol, dehydrodiconiferyl alcohol, isolariciresinol, pinoresinol, and 3,4-divanillyltetrahydrofuran. These compounds were either isolated from Urtica roots, or obtained semisynthetically. Their affinity to human sex hormone binding globulin (SHBG) was tested in an in vitro assay. In addition, the main intestinal transformation products of plant lignans in humans, enterodiol and enterolactone, together with enterofuran were checked for their activity. All lignans except (-)-pinoresinol developed a binding affinity to SHBG in the in vitro assay. The affinity of (-)-3,4-divanillyltetrahydrofuran was outstandingly high. These findings are discussed with respect to potential beneficial effects of plant lignans on benign prostatic hyperplasia (BPH).
PMID: 9434605 [PubMed - indexed for MEDLINE]
Many studies suggest that it is " competitive" meaning it competes and beats out shbg. So it is not permanent like a say a suicidal aromatase inhibitor would be when it comes to estrogen. But more like Letro or adex would be. When you stop talking it and once its half life clears the effect stops and SHBG goes back to doing its job.
This is yet another reason why I keep telling people to use Hcgenerate ON CYCLE and forma-stanzol after during pct. WHY..
Well formastan also lowers shbg but a good 34% or more. However it has a "long lasting" effect because it is not competitive in its effects its suicidal.
Formestane as treatment of advanced breast cancer in ... [Tumori. 1994] - PubMed - NCBI
you may read the entire study but Ill skip to the last part. Lower E2=lower SHBG and here is the conclusion to the study
The study showed that formestane induced a long-lasting suppression of E2 levels and a satisfactory overall response. In our opinion, the drug is an effective and well-tolerated approach in the management of advanced breast cancer in elderly patients.
It should also be noted that well using formastan ( main igredent in forma-stanzol) a rise in serum FSH was also observed during the therapy


Now clomid and nolvadex like any serm will cause a RISE in SHBG and a rise in blood level estrogen. This is why using a suicidal aromatase inhibitor and a serm during pct is a must. Now forma-stanzol is a combo of both and than some!!! Add in a great test booster and your pct is complete.
Run your Hcgenerate during cycle , forma-stanzol after. Thank you

