Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

• Gas.
• Upset stomach or throwing up.
• Not hungry.
• Stomach cramps.
• Dry mouth.
• Headache.

Healthline points out one aspect of immunity boosters that make the products unnecessary for most people. Nutrients like B12 and vitamin D remain important for strong energy and immunity levels. But, taking supplements like these will only help those who are deficient in the first place.

Learn more benefits of a healthy immune system.

• Feeling Healthy.
• Wounds Heal Fast.
• Less Fatigue.
• Few Infections.

It can take anywhere from several weeks to a few months of consistently taking a vitamin or mineral supplement to see noticeable changes, depending on several factors.

"There's no evidence that they help in fighting disease." To understand why, you need to know a little about how the immune system works.

Healthline points out one aspect of immunity boosters that make the products unnecessary for most people. Nutrients like B12 and vitamin D remain important for strong energy and immunity levels. But, taking supplements like these will only help those who are deficient in the first place.

Summary. When you start taking vitamins, you should expect to experience the following benefits - your energy levels will increase, more food will be converted into energy, your short-term memory will improve, your immune system will become stronger, your muscles will become stronger, and your skin will look healthier.

Nutrients like B12 and vitamin D remain important for strong energy and immunity levels. But, taking supplements like these will only help those who are deficient in the first place. It's also key not to take too much of any supplement.

Myth. Taking a daily multivitamin is probably a good idea to stay healthy if you eat poorly. But taking megadoses of a single vitamin or supplement has not been proven to help the immune system.

Generally speaking, water-soluble vitamins work within days, while fat-soluble vitamins can take weeks or months. Some only need to be taken for a limited time period before feeling the beneficial effects, but the dose and duration will depend on why you're taking supplements.

In general, you'll feel results within minutes to hours, depending on whether you receive an IV infusion or take a vitamin tablet. If you are not vitamin deficient or take fat-soluble vitamins, vitamins may work more slowly. You may feel results within days to weeks after consuming a vitamin.

The best way to know if your multivitamin works is to get bloodwork done to examine the levels of various vitamins and minerals in your body. "You should be able to tell if your multivitamin is working based on whether any physical signs of nutrient deficiencies have resolved," says Lubeck.