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This is Dr. David
the liver is a strong organ which can detox the body for a lifetime.
avoiding alcohol and avoiding excessive tylenol products are best.
some people use milk thistle without much good data supporting it.
there is no proven method to protect liver while you are on testosterone therapy.
if you are on testosterone, you should be on an aromatase inhibitor to prevent conversion of excessive testosterone into estrogen.
best thing is to keep your testosterone levels lower and not too high. higher doses of testosterone can cause more elevation of your LFT
let me know if you have questions.