Individual variation in muscle growth potential among women is influenced by baseline physiological differences and training stimulus, not solely testosterone.

“Is it true that some women have a much greater potential to build muscle mass uh that's independent of their testosterone levels? I'd say yes, it's independent of the testosterone levels, but we're going to start with different baselines and then it depends on the stimulus that you are using for growth. And some people are adapting to that growth stimulus to a greater extent than others, but part of that is effective, consistent, progressive training, and then part of it is arguably some genetic factors.”