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How long do vitamins last?
The Therapeutic Goods Administration dictates that if supplement manufacturers list an expiration date on their products, they must maintain records that prove that the products contain what the labels state, at expiration. This is because, like everything else, vitamins have a "lifespan." While they are generally quite stable, especially when kept away from direct sunlight and high temperatures, there may be a gradual loss of potency over time. A reputable company will slightly "overfill" their supplements, meaning that they put enough of each nutrient in the tablet to compensate for any loss of potency over time. A two-year expiration date means that the company is certifying that the product will continue to meet or exceed label claim for two years from the date of manufacture.
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