Can taking a multivitamin with vitamins B and D help increase energy?

Vitamins are by definition essential nutrients. B vitamins, in particular, are involved in enzyme systems that yield energy from the food we eat. If vitamin status is poor, then these enzyme systems do not operate at full capacity. This may be more noticeable if you are active. Supplementing with additional B vitamins can allow these systems to work at a higher capacity, allowing you to “feel” more energetic. It is important to note, however, that B vitamins do not provide energy on their own. They are not stimulants, like caffeine. If your B vitamin status is fine and you supplement with more, I would NOT expect an increase in energy. Vitamin D is important for normal health and functioning, but should not have any noticeable impact on energy levels.
The B vitamins are crucial in normal metabolism, which involves all the chemical and physical processes in the body that use or convert energy, from breathing to digesting your food. Fatigue is a common symptom of B12 deficiency, which causes anemia. Too little iron can also cause fatigue and anemia. If you are deficient in either of these nutrients, taking them in supplements may help you feel more energized.

Fatigue is not among the most common symptoms of vitamin D deficiency, which include thinning of bones. A lack of the vitamin can cause muscle weakness, though, and supplements can help, particularly in older people at risk of falls.

You should be able to meet your nutritional needs and feel energetic by eating a well-balanced diet. But if you think you may be deficient in vitamins B or D, iron or any nutrient, talk to your doctor about whether you need to take supplements.
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
You need B vitamins for your mitochondria to produce energy from glucose. Most of us absorb the B vitamins well (either in liquid or pill form), but 99 percent of us don't get enough from our diets. Take a multivitamin in the morning and evening (twice a day to keep stable levels, since we pee the water-soluble ones out) to keep you energized. Get your B and D levels checked yearly. You may be the rare person who doesn't absorb these well from your stomach and intestine and needs a B vitamin injection yearly. Much of the world is short of vitamin D -- and you need it to help fight cancer, to keep arteries young, and to aid brain function. So make sure you get it measured and take what is needed to keep its level normal.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.