Getting adequate vitamin B12 is important. If you need to take it, keep in mind that vitamin B12 side effects as a result of exceeding the DV are rare.

Emergen-C is similar to a multivitamin because it contains many of the water-soluble vitamins that act as antioxidants plus minerals that act as electrolytes.

You're not alone if you have vitamin nausea. Limiting your dose to the recommended amount or taking your vitamin with food may help prevent stomach upset.

If you have a magnesium deficiency and have changed your diet or taken supplements, the length of your wait before feeling benefits depends on several factors.

If you're at risk for a vitamin D deficiency, it's important that you take steps to increase your levels to prevent long-term health effects.

Levels above the vitamin B12 normal range are unlikely to occur from your diet, but overuse of supplements and certain medical conditions could cause an excess.

Iron pills can cause stomach upset, cramping and diarrhea, but slow-release pills may help reduce these negative effects. Taking your iron with food also helps.

Vitamin B deficiency in certain components of B-complex can cause mild to severe symptoms, including dermatitis, cognitive impairment, depression and anemia.

Iron-deficient anemia can cause headaches, and iron supplements can help you avoid anemia headaches. However, iron supplement headaches can occur if iron levels become excessive.

Vitamin B12 is an essential nutrient that plays an important role in the production of red blood cells and health of the nervous system. Your B12 injections may not be working for many reasons.

Vitamin D deficiency is associated with fatigue and obesity. However, more research is needed to better understand the relationship between these conditions.

Folic acid is just as important for men as it is for women. It helps prevent anemia, cancer, cognitive problems, digestive system issues and heart disease.