In addition, anyone who is deficient in vitamin C would benefit from taking a supplement, since vitamin C deficiency is linked to increased risk of infections ( 5, 6, 7). Vitamin B3 (niacin) is involved in many metabolic processes, including the conversion of food into energy, the production of cholesterol, and the repair of DNA. It is also important for nerve function, skin health, and brain function. Consuming probiotics: Probiotics — bacteria that are good for your gut — can be consumed as supplements or via fermented foods like kimchi, kefir and yogurt. These bacteria can rebalance your gut and boost immunity ( 34, 35).

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Zinc: Zinc is a mineral that is involved in cell growth and repair, immune function, and wound healing. It is also important for the senses of taste and smell.

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Emergen-C Chewables have more Vitamin C than 10 oranges Vitamins B1, B2, B3, B6 and B12 are essential nutrients that play a vital role in many bodily functions, including energy production, cell metabolism, and nerve function. Manganese: Manganese is a mineral that is involved in bone metabolism, energy metabolism, and antioxidant defence. Chromium: Chromium is a mineral that is involved in carbohydrate metabolism and blood sugar regulation. Vitamin C deficiency is rare, but there are some subtle signs to watch out for. Here are the 15 most common signs and symptoms of vitamin C deficiency. READ MORE

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Ingesting more than 2 grams of vitamin C can trigger unpleasant side effects including nausea, abdominal cramps and diarrhea — and may increase your risk of developing kidney stones ( 22, 23, 24, 25). Supplementing with 50 mg of vitamin B6 per day or 500 mcg of vitamin B12 every other day for at least two weeks has been shown to reverse these effects ( 14, 15, 16). Vitamin C likely has such effects due to accumulating inside various types of immune cells to help them fight infections. Keep in mind that research into vitamin C’s mechanisms is ongoing ( 8, 9). 2. B VitaminsFor example, one serving of regular Emergen-C contains just 2 mg of zinc, while clinical trials use much higher doses of at least 75 mg per day ( 17).