Yes, getting too much vitamin D can be harmful. Very high levels of vitamin D in your blood (greater than 375 nmol/L or 150 ng/mL) can cause nausea, vomiting, muscle weakness, confusion, pain, loss of appetite, dehydration, excessive urination and thirst, and kidney stones.
The main consequence of vitamin D toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause nausea and vomiting, weakness, and frequent urination. Vitamin D toxicity might progress to bone pain and kidney problems, such as the formation of calcium stones.
But how do you flush vitamin D out of your system – and can you even do that? Yes, by ensuring you consume plenty of water. This will encourage urination, allowing your body to shed the excess vitamin D and calcium more quickly. Prescription diuretics like furosemide can also be helpful.
While vitamin D itself is unlikely to be causing your anxiety, that doesn't mean it can't, and the activities that you do to help increase vitamin D are valuable for your anxiety anyway.
Because vitamin D toxicity can cause side effects like rapid heartbeat, confusion, restlessness and chest pains, it can potentially cause feelings associated with anxiety.
Extremely high vitamin D levels are harmful and can cause nausea, vomiting, confusion, excessive thirst and kidney stones. Vitamin D supplements can interact with certain medications, so check with your doctor before starting one.
Here's the rub, though: while it's hard to know whether you're vitamin D deficient, taking too much could be much worse. High doses have the potential to cause nausea, vomiting, constipation, and weakness.
chest pain, feeling short of breath; growth problems (in a child taking cholecalciferol); or. early signs of vitamin D overdose--weakness, metallic taste in your mouth, weight loss, muscle or bone pain, constipation, nausea, and vomiting.
Excess Vitamin D
You may also develop kidney stones or kidney damage. Other symptoms of vitamin D toxicity include weakness, fatigue or tiredness, vomiting, weight loss, itchy skin, constipation and muscle control issues.
Recently, it has been proposed that vitamin D plays an important role in serotonin and melatonin regulation, which further indicates the relevance of vitamin D in mental health, especially the regulation of mood and sleep [4,6].
Safety and side effects
However, taking too much vitamin D in the form of supplements can be harmful. Children age 9 years and older, adults, and pregnant and breastfeeding women who take more than 4,000 IU a day of vitamin D might experience: Nausea and vomiting. Poor appetite and weight loss.
Between late March/early April to the end of September, most people can make all the vitamin D they need through sunlight on their skin and from a balanced diet. You may choose not to take a vitamin D supplement during these months.
Vitamin D is another supplement that can cause heart palpitations when taken in large amounts. Indeed, a March 2018 review found that excess vitamin D in your system was linked to an increased risk of atrial fibrillation, a condition that causes an irregular and often rapid heartbeat.
A study found that higher serum vitamin D levels were associated with a reduced risk of weight gain in normal weight adults [10]. Another study reported that subjects who gained ≥5% weight had lower vitamin D levels than subjects who lost >5% weight [11].
Growing evidence has demonstrated that vitamin D has a role in sleep regulation [12]. Specifically, vitamin D deficiency (VDD) can increase risk of sleep disorders and is associated with sleep difficulties, shorter sleep duration, and nocturnal awakenings in children and adults [13,14,15].
However, increasing vitamin D levels with supplements may suppress melatonin generation, leading to sleep disturbances. For this reason, people should take vitamin D supplements in the morning to replicate how the body synthesizes them from sunlight rather than taking them at night.
Phenobarbital, phenytoin, and other anticonvulsant medications -- These medications may accelerate the body's use of vitamin D. Mineral oil -- Mineral oil also interferes with absorption. In addition, Vitamin D may enhance the effects of doxorubicin , a medicine used to treat a variety of cancers.
Vitamin D undergoes further chemical changes, first in the liver and then in the kidneys, to become calcitriol. Calcitriol acts on the intestine, kidneys, and bones to maintain normal levels of blood calcium and phosphorus.
Hypercalcemia
Excessive intake of vitamin D can increase the calcium level in the blood, and can cause harmful effects like fatigue, dizziness, excessive thirst, frequent urination, etc.
The short answer is yes. Dizziness is a common symptom of vitamin D deficiency, along with fatigue and brain fog. If you are feeling dizzy all the time, it is worth checking your vitamin D levels. Insufficient vitamin D can cause dizziness because it plays a role in maintaining blood pressure and fluid balance.
Conclusion: Oral vitamin D 3 has no significant effect on blood pressure in people with vitamin D deficiency. It reduces systolic blood pressure in people with vitamin D deficiency that was older than 50 years old or obese.