Hello im like 40yrs. old and would like to no. if there is a otc testosterone booster that works?

No: Nothing "boosts" testosterone. Do not waste money on any product that says it does.

Define "works": These products are "supplements" and as such are not regulated by the FDA. They never have to contain what they say, or do what they promise. Most will boost some of the hormone precursors which produce all the side effects of testosterone, without actually creating testosterone. Acne, shrunken testis, steroid rage, etc. should all be expected.