Official answer. Generally, it takes a few weeks of taking daily vitamin D supplements for vitamin D levels in the body to rise. Each 1,000 IU of vitamin D3 taken daily is expected to raise blood levels of 25(OD)D by 10 ng/ml after a few weeks.
How Long Does It Take for Vitamin D to Work? If you have a vitamin D deficiency, you may notice improvements within 4-6 weeks of consistent supplementation. However, that timeframe can vary depending on what your baseline vitamin D levels are.
The team found that these recovery rates significantly improved after the patients took a fixed dose of oral vitamin D for 10-12 weeks. The average phosphocreatine recovery half time decreased from 34.4sec to 27.8sec. All patients reported an improvement in symptoms of fatigue after having taken the supplements.
Vitamin D does not directly give you energy however studies have shown that vitamin D can increase energy levels from within the cells of your body and that excessive fatigue and tiredness may be caused as a result of a vitamin D deficiency.
Symptoms when vitamin D is low
Fatigue. Not sleeping well. Bone pain or achiness. Depression or feelings of sadness.
Bone and lower back pain may be symptoms of inadequate vitamin D levels ( 17 , 18 ). Vitamin D helps maintain bone health by improving your body's absorption of calcium. One study in 98 adults with lower back pain linked lower levels of vitamin D to more severe pain.
When vitamin D levels are low and the body isn't able to properly absorb calcium and phosphorus, there is an increased risk of bone pain, bone fractures, muscle pain and muscle weakness. In older adults, severe vitamin D deficiency (levels less than 10 ng/mL) may also contribute to an increased risk of falls.
Conclusion: Vitamin D treatment significantly improved fatigue in otherwise healthy persons with vitamin D deficiency.
As a fat-soluble vitamin, vitamin D is stored in your body fat and liver. Excess levels of vitamin D in your system can lead to an array of complications and symptoms, including weakness and fatigue.
The symptoms of vitamin D deficiency are often subtle, so many people don't know they're deficient. Some of the effects of vitamin D deficiency include: Fatigue or tiredness.
Vitamin B12
Along with the other B vitamins, vitamin B12 helps transform the food you eat into energy that your cells can use. It also keeps your body's nerves and blood cells healthy and helps prevent a type of anemia that can make you weak and tired ( 22 ).
Vitamin D deficiency may negatively impact sleep quality. Some anecdotal reports assert that supplementing with vitamin D at nighttime may interfere with sleep, but scientific data to that effect is unavailable.
Early research suggests it is inversely related to melatonin, your sleep hormone. Increasing vitamin D levels may suppress melatonin levels. So, it makes sense that taking it at night could disrupt your sleep.