Opti-Nutra sells this nootropic supplement only on their official website. If you want to get the legit Mind Lab Pro product with a guarantee, buy it from the manufacturer’s official website, Click here to Buy. But additionally, the product can be bought from numerous vendors, in such cases, Opti-Nutra will not be liable for its quality or guarantee. Mind Lab Pro is the only official website for this supplement, so you should avoid buying from other sellers.