Anti-oestrogen supplement Esto Suppress contains tamoxifen
Well that's great. We must have been sleeping. It's all over forums, blogs and news sites – and we've missed it. The lab at the European Monitoring Centre for Drugs and Drug Addiction has discovered that the supplement Esto Suppress contains the anti-oestrogen tamoxifen. Tamoxifen is the active ingredient in Nolvadex.
Bodybuilding forums alerted the researchers, based in the Portuguese capital Lisbon, to the fact that Pharma Labs' Esto Suppress might contain tamoxifen. The active ingredient listed on the label of Esto Supress is (Z)-1-(p-dimethylaminoethoxyphenyl)-1,2-diphenyl-1-butene. This is a corruption of the official chemical name for tamoxifen: (Z)-2-(4-(1,2-diphenylbut-1-en-1-yl)phenoxy)-N,N-dimethylethan-1-amine.
According to the manufacturer, Esto Suppress is a substance that "eliminates estrogen from your system and is essential post cycle or on-cycle when using any heavily aromatizable compounds". There are posts on bodybuilding forums which would indicate that Esto Suppress lives up to the claims.
"I used it for my 1st PCT [Post Cycle Therapy - red.] and it did the job", writes The Big Dog on the UK Muscle bodybuilders forum. [uk-muscle.co.uk] "I think you will find it's the closest thing you can get to nolva OTC."
In the same thread there's a posting by HenryV - yep, the Henry V - who'd already worked out the exact contents of Esto Suppress.
One capsule of Esto Suppress supposedly contains 10 mg active ingredient. If you follow the manufacturer's recommended dose, you would ingest 20 mg per day. And that's the dose that doctors prescribe for men with gynaecomasty. After a course of steroids chemical athletes take similar kinds of doses.
But the manufacturer of Esto Suppress has under-dosed its products write the researchers at the European Monitoring Centre for Drugs and Drug Addiction in the biomedical scientific journal BMJ. They acquired four samples of the product and found that the capsules contained different amounts of tamoxifen: 3.8 mg, 0.9 mg, 3.0 mg and 0 mg.
In the best-case scenario you'd ingest 7 mg tamoxifen a day by taking Esto Suppress. That's not much. If you still want to obtain tamoxifen on the black market you're probably better off approaching a dealer.
The researchers acquired their samples between 2010 and 2012. "It is not known whether the Esto Suppress currently being sold still contains tamoxifen", they write.
BMJ. 2014 Feb 13;348:g1476.
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