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Typically 10:1 means how much it is concentrated. So if a pill contains 250mg of concentrate at 10:1 it is equal to taking 2500mg of the raw substance. If your taking enough to alter your hormone levels enough to grow boobs, it would probably be considered "not safe" by the medical community. Given, it would put you at slightly higher risk of issues such as breast cancer or blood clots.
Safety is always relative to the risk vs reward. In my case, even a small amount (500mg) of PM causes a spike in blood pressure for about 4-6 hours. 2500mg at once would not be something I would take. Everyone is different, just be careful and watch for adverse side effects.
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Thanks for this info, very helpful. Yes, I think I now feel these types of ratios just seem too unclear for me to ever feel comfortable with it. As someone has suggested below, I'm going to try a mainstream seller now.
I'm probably going to break up some capsules of a 'known' concentration and make it up as a topical cream. So if anything I'll be consuming a smaller/safer amount of PM.