Can Vitamins and Supplements expire?

Vitamins and supplements can only be used for a certain period of time to maintain their chemical stability or potency. If you take a product past its expiration date, the quality and potency of the product may not be guaranteed, and sometimes it may be ineffective or even harmful. A vitamin or supplement bottle usually has a manufacturing date and an expiration date. The expiration date indicates the length of time from the date of manufacture that the product is of optimal quality and safety, after which it is not recommended to use the product. If you try to take a product after the expiration date, you may run the risk of reduced potency or side effects, so be sure to check the expiration date when purchasing vitamins and supplements, and consume them within the expiration date if possible.

Is it safe to take expired vitamins and supplements?
What happens to products after "best before"?
Will “expired” products still bring me benefits?
Are there any side effects of consuming expired products?
How to store them to preserve them longer?

Is it safe to take expired vitamins and supplements?

Taking expired vitamins and supplements is not recommended. Consuming expired products may not guarantee the quality and safety of the product. When a vitamin or supplement expires, the chemicals in it may break down or change, which can reduce the potency of the product or cause harmful substances to form. Taking expired products can cause side effects such as indigestion, vomiting, and diarrhea, and unexpected allergic reactions. Therefore, it is important to check the expiration date on products and avoid using expired products to ensure safe and effective consumption. If the expiration date is nearing, it is recommended to use the old product and purchase a new one to replace it.

What happens to products after "best before"?

The "best before" label refers to the period of time from the date of manufacture that ensures the highest quality and potency. During this time, the product remains stable and the stated nutrients or active ingredients are in the correct concentration and state.
However, after this period, the color, taste, aroma, freshness, etc. of the product may change and the quality and potency of the product may not be guaranteed and a number of changes and instabilities may occur. The active ingredients contained in a product may break down or deteriorate over time, which may reduce the efficacy of the product. In addition, the physical properties of a product may change over time, which may result in changes in color, odor, and taste. Expired products may increase the growth of bacteria and mold, which may reduce the safety of the product. Therefore, it may not be safe to take products past the "best before" date and we recommend consuming products within their expiration date whenever possible.

Will “expired” products still bring me benefits?

Expired products are unlikely to provide the same benefits as before, as their quality and potency typically deteriorate past the period from the date of manufacture that ensures optimal potency and safety. Taking an expired product may actually increase side effects or health risks rather than provide benefits. The benefits provided by vitamins and supplements come from the nutrients they contain. When a product expires, these nutrients can become unstable or lost. This will reduce the nutritional value provided by the product. Therefore, expired products are unlikely to provide any benefits and may even pose a health risk. To ensure safe and effective consumption, it is recommended that you check the expiration date and purchase a new product to replace it if it is nearing the expiration date.

Are there any side effects of consuming expired products?

Consuming expired products can cause a variety of side effects. They may be related to the product's ingredients deteriorating, reducing active ingredients, or producing harmful substances. Expired products can cause unexpected reactions during the digestive process, resulting in indigestion, abdominal pain, and gas. Some people may experience skin reactions such as skin rashes and itching when consuming expired products. These side effects may vary from product to product, and may also depend on an individual's health status, so it's important to avoid consuming expired products. Checking expiration dates and using products that are not expired is a way to protect your health.

How to store them to preserve them longer?

It is important to follow the correct storage methods to preserve vitamins and supplements for longer. The place where you store your vitamins and supplements should be dry and cool, out of direct sunlight. High temperatures or humidity can harm the stability of the product. You can reduce moisture by storing them with a desiccant or silica gel. Make sure that the lid of the product is tightly sealed to prevent air and moisture from entering. Air and moisture can reduce the quality of the product. In general, vitamins and supplements are best stored at room temperature rather than refrigerated. If refrigeration is recommended, then follow the manufacturer's instructions.

References
1.Korea Centers for Disease Control and Prevention National Health Information Portal - Nutritional Supplements - kdca.go.kr. https://health.kdca.go.kr/healthinfo/biz/health
2.How to reduce side effects of daily 'vitamin and mineral' supplements and take them properly - http://www.healtip.co.kr/news/articleView.html?idxno=263.
3.How to take and store medicines properly - kca.go.kr. https://www.kca.go.kr/home/board/download.do?