Why would masteron/primo lower libido?

Agreed, that was a pretty nonsensical statement.

An AI might be superior to masteron simply because masteron is not an AI lol. However if you need to run e2 higher to make use of your HGH maybe you want the estrogen beta receptor stimulation of masteron to keep gyno in check but reap other benefits to running e2 slightly elevated out of range.

Primo does have a metabolite that acts as an AI, how would running an AI be better than another anabolic that can act as an AI?
None of these compounds are inherently better or worse than one another. They are all different. What's important is understanding each compound so that you can make the right choice for your situation and your goal.
 

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