Vitamin D can be low even if you live somewhere sunny. We make vitamin D from sunlight, but many things affect how much we actually get, including time spent indoors, sunscreen, skin tone, diet, age, body weight, and how well our body absorbs vitamins.
Low vitamin D may not cause any symptoms at all. When symptoms do occur, people may notice fatigue, low energy, muscle weakness, aches, or changes in mood. Low vitamin D has also been linked with depression and obesity, but that does not mean it is always the cause of depression or weight gain.
Vitamin D is especially important for healthy bones and muscles because it helps your body use calcium.
If vitamin D deficiency is found, treatment is based on your individual needs. Oral vitamin D is usually the preferred treatment and may take time to raise your level. Injectable vitamin D may be considered in certain situations, such as when absorption is a problem, but it is not needed for most people.
It is also important not to take large amounts of vitamin D on your own. Too much can be harmful.
If you have ongoing fatigue, weakness, aches, or low mood, talk with your healthcare provider. Vitamin D may be one piece of the puzzle, and your provider can decide whether testing or treatment makes sense for you.
Take care and stay healthy!