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Has a department store cosmetologist ever told you that the skin firming product you just bought for $50 won’t be effective if you cover it up with a different brand of moisturizer?
It’s amazing how many people buy that line. I certainly have, several times. If you’re wondering from where this twisted concept was derived, It’s loosely based on the medical warning not to mix certain acidic juices with prescription drugs since they can negate a drug’s effectiveness, (which, by the way is true).