Celtic Labs has just released several new products on presale to the public.  Most are ‘clones’ of existing designer steroids, though one of them is novel; “Celtic Mass” is intended to be a ‘prohormone’ to the recently-banned designer steroid, methasterone (superdrol). 
The active ingredient is labeled 2a,17a-dimethyl-5a-androstane-3,17b-diol, however the trivial name “superdiol” is less of a mouthful.
This compound is known to be a metabolite of methasterone (superdrol) in both humans and animals. 
Though the conversion of the ‘diol’ form to methasterone has not been studied, diols have a long track record as metabolic precursors to active (and typically illegal) compounds: 1-androstenediol was sold as a precursor to 1-testosterone, Halodrol-50 as a precursor to Oral Turinabol, methyl-1-androstenediol (“Alpha One”) as a precursor to methyl-1-testosterone (M1T), and methyl-1,4-androstadiene-diol (M14ADD) as a precursor to methandrostenolone (Dianabol).
 PHF Supplements: Celtic Labs
 Classification of two steroids, prostanozol and methasterone, as Schedule III anabolic steroids under the Controlled Substance Act. Final rule. Fed Regist. 2012 Jul 30;77(146):44456–62.
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 Lootens L, Meuleman P, Leroux-Roels G, Van Eenoo P. Metabolic studies with promagnon, methylclostebol and methasterone in the uPA+/+-SCID chimeric mice. J. Steroid Biochem. Mol. Biol. 2011 Nov;127(3-5):374–81.
 G. Rodchenkov, T. Sobolevsky, V. Sizoi. New designer anabolic steroids from internet. Recent Adv. Doping Anal. 2006, 14, 141.
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