Are they safe for under 21ers? I've had low Test for much of my adolescence.
How do you know that you have low test?
But you are 19, I don't see a problem in taking some kind of herbal test booster...
Best bet is something like Blue-Up.
Safety isn't a true issue with the majority of test boosting, legal products.... it's moreso the efficacy. It's not necessary for someone with the normal test levels of an under 21'er.
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Have you heard about N.O. Uptake? ;-)