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You can’t. And, 98% of these products DO NOT WORK, period. Don’t waste $$ on these scams folks. Moderate exercise, eating a lot less fast food garbage and mediation 10 minutes a day will all show improved mental clarity, memory, focus. Anyone that blows $30 a month on OTC vitamins is fooling themselves. I see another problem in society: lots of people buying Gatorade and other sports drinks, people that definitely don’t exercise or work out. Folks, these drinks were made for athletes and those that exercise. It’s not for kids either.