Both. According to Dr. Saya, Proviron is probably even more effective than Danazol at lowering SHBG. Ref.Proviron used to be prescribed regularly in the UK for high SHBG TRT users until it was discontinued by Bayer. Along with Sustanon it got my SHBG down from mid 60s to mid 30s. Was it just the Sustanon that did that or the Proviron?
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Dr. Justin Saya said:To my knowledge Proviron is both more effective at lowering SHBG and also worse for lipids, but is not approved in the US and cannot be legally prescribed. Danazol can be legally prescribed (off-label).