...hey bud! :smoke: ...sure, it's possible,... that brand has a very complex mix of ingredients, including amino acids/vitamins, which can go south if really old or contaminated,... there should be a exp. date, or made-on date somewhere on the bottle...and you can always call the company and inquire... what makes you think it went bad? Is there a bunch of flocculant junk floating around, or kinda grainy precipitate?..