Methoxy is worthless
Methoxy has basically no conclusive research, and its anabolic benefits are dubious and unfounded at best. Even so, livestock producers are using it to naturally increase the size of their animals (hormone free), so there's probably some potential here. And any potential muscle-building effects of these supplements seems to occur as the result of increased calcium, potassium, and nitrogen retention, as well as by suppression of cortisol without androgenic or liver-damaging effects.
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All in all, if you're willing to role the dice on a supplement that has more hearsay than anything else and spend the money (it's pretty expensive), methoxy might be worth a try for muscle support. But I'd wait for more valid research before drawing a conclusions on its real benefits.