The Ultimate Estrogen Blocker and Anti-Aromatase Formula.*
A-HD™ was designed to support increased Testosterone production while minimizing Estrogen Activity.*
A-HD™ is a professional quality anti-aromatase product that supports a Lean, Dry, Competitive Looking Physique.*
Research suggests that this novel lignin-class compound has anti-estrogenic supporting activity.* 
Research suggests that this compound possesses powerful estrogen regulating properties via multiple mechanisms.*
this novel lignin-class compound has been suggested to inhibit
aromatase, inhibit 3 ß-hydroxysteroid dehydrogenase and 17
ß-hydroxysteroid dehydrogenase, down-regulate 5 alpha-reductase,
modulate tyrosine kinases as well as other protein kinases, and
favorably modulate plasma free testosterone levels.* Moreover, use of
this compound prior to sustained physical exercise/exertion helps to
reduce muscle damage via up-regulation of hepatic glutathione (GSH)
levels and down-regulation of malodialdehyde (MDA) levels in skeletal
Research suggests this novel stilbenoid-class compound, which is
methylated, is markedly more efficiently metabolized than non-methylated
stilbenoid-class compounds for activation of the SIRT1 gene,
up-regulation of plasma free testosterone production via selective
estrogen receptor (ER) modulation, inhibition of aromatase, enhanced
glucose metabolization, and support healthy insulin sensitivity.* As a
methylated stilbenoid-class compound, this compound is not sulfated by
P450 enzymes, which translates into significantly greater bio-activity. [6,7]
Research suggests that this phenolic-acid class compound exhibits
bio-active androgenic activity via multiple pathways, such as marked
down-regulation of malondialdehyde (MDA) levels, resulting in powerful
potential up-regulating effects on plasma free testosterone and
luteinizing hormone.* 
 Biosci Biotechnol Biochem. 2006 Nov;70(11):2783-5.
Research suggests that this remarkably active, powerful and specific
phenolic acid-class compound may support healthy levels of
prostaglandins, and inhibit 5-alpha-reductase (which down-regulates
conversion to dihydrotestosterone) activity.* Moreover, this compound
acts as to support regulation of the estrogen receptor (ER).* [9,10]
 J Toxicol Environ Health A. 1999 Apr 23;56(8):555-70.
 J Vet Med Sci. 2002 Sep;64(9):761-5.
 J Nutr. 2006 Jun;136(6):1545-51.
 Exp Biol Med. 2007 Sep;232(8):1071-80.
 Curr Clin Pharmacol. 2006 Jan;1(1):81-101.
 Mol Nutr Food Res. 2010 Mar;54(3):335-44.
 Ir J Reprod Med. 2009 Winter;7(1):7-12.
 Ann NY Acad Sci. 2004 Dec;1030:501-7.
 J Steroid Biochem Mol Biol. 2009 Jan;113(1-2):65-74