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Taking an expired vitamin or supplement is highly unlikely to cause you harm. Unlike food, vitamins don't go “bad,” nor do they become toxic or poisonous. For best results, avoid using vitamins that are past their expiration date. These vitamins may not be as potent.
Then, can vitamin C pills go bad?
Once expired, toss them out. Flavours, too, break down quickly and are usually the first ingredient to go after expiration. While your chewable vitamin C or gummy multivitamin may still have as much as 90 per cent of its original potency three months past expiry, don't expect them to taste the same.
Subsequently, one may also ask, how long can you take medicine after the expiration date?
1 to 2 years
If stored away from heat, light and humidity, supplements generally last about two years after the date of manufacture before the concentrations fall below 100 percent of the amounts listed on the label.