Supporting a wealth of wildlife, the mangroves are a unique habitat. Mangroves are like botanical amphibians, and form some of the most productive ecosystems on Earth. They provide food, shelter, firewood and construction materials that have been harvested sustainably for thousands of years.
Check the expiration date on your vitamin supplements for the first indication of how long they'll last. Vitamin supplements typically bear an expiration date of a year or so from the time they're manufactured. If you store them properly, they should stay potent for at least this long. After the expiration date, you can still expect to use them without harm, but there's no guarantee on potency.
Unlike protein, carbohydrates and fats, vitamins do not yield usable energy when broken down - they are truly calorie free. However, they assist the enzymes that release energy from carbohydrates, proteins and fats, while providing no energy themselves. This does not mean vitamins are not important! Although the vitamins themselves don't provide energy, many are required for chemical reactions that do produce energy. In this sense, vitamins can give you energy. Vitamins are substances the body needs in small amounts to support most body functions and prevent disease.