Why do doctors prescribe vitamin D2 instead of D3?
Sophia Koch
Updated on March 01, 2026
You may wonder why doctors prescribe vitamin D2 instead of D3, if vitamin D3 appears to be more potent than vitamin D2. The vitamin D prescription you get from your doctor is typically for 50,000 units of vitamin D2. Vitamin D2 is indicated to treat calcium disorders and parathyroid disorders.
Is it better to take in D vitamins D2 or D3?
Studies have repeatedly shown that vitamin D3 is superior at raising levels of vitamin D in the body. These findings were supported by a recent review of the evidence which found that vitamin D3 supplementation increased vitamin D levels in the body better than vitamin D2.Why did my doctor put me on vitamin D2?
Sometimes vitamin D2 is used to help a vitamin D deficiency, though doctors typically recommend vitamin D3 as a first-line therapy. Vitamin D2 is also given to prevent or treat various bone disorders or medical conditions that cause low levels of calcium or phosphate.What's the difference between vitamin D2 and D3?
There are two main forms of dietary or supplemental vitamin D: D2 and D3. Both forms contribute to overall vitamin D levels in the body, and the most significant difference between them is that vitamin D2 is derived from plants, while vitamin D3 comes from animals, typically fatty fish or sheep's lanolin⁴.Is D2 or D3 better for osteoporosis?
They are vitamin D2 and vitamin D3. Previous research suggested that vitamin D3 was a better choice than vitamin D2. However, more recent studies show that vitamin D3 and vitamin D2 are fairly equal for bone health.Vitamin D2 vs. D3: VERY DIFFERENT
What is vitamin D2 50 000 units used for?
Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.Does vitamin D2 give you energy?
Vitamin D keeps your immune system strong and can help regulate insulin levels. It keeps your energy levels up and enhances your mood, too.What are the side effects of vitamin D2 1.25 mg?
Side effects that you should report to your doctor or health care professional as soon as possible:
- allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue.
- bone pain.
- increased thirst.
- increased urination (especially at night)
- irregular heartbeat, high blood pressure.
- seizures.
Is 50 000 units of vitamin D2 a lot?
For the majority of the population, a daily intake of 400-800IU of vitamin D is adequate. Even on the high end, this would only equal about 5,000IU weekly. However, some research has shown that some patients who are vitamin D deficient may need up to 50,000IU weekly to reach normal ranges.What is vitamin D2 good for?
Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.How much vitamin D2 should I take daily?
This is according to most medical expert societies, but the amount recommended by the FDA is 20 mcg per day, or 800 IU (1 mcg vitamin D is equal to 40 IU). The best way to get your daily vitamin D is through exposure to sunlight.Who should not take vitamin D3?
Who should not take VITAMIN D3?
- sarcoidosis.
- high amount of phosphate in the blood.
- high amount of calcium in the blood.
- excessive amount of vitamin D in the body.
- kidney stones.
- decreased kidney function.
What are the symptoms of vitamin D2 deficiency?
Symptoms of vitamin D deficiency can include muscle weakness, pain, fatigue and depression. To get enough D, look to certain foods, supplements, and carefully planned sunlight.
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Signs and symptoms might include:
- Fatigue.
- Bone pain.
- Muscle weakness, muscle aches, or muscle cramps.
- Mood changes, like depression.
Can vitamin D2 cause stomach problems?
If you take large doses of vitamin D, you may experience stomach pain, loss of appetite, constipation, or diarrhea as a result of elevated calcium levels.Why is my vitamin D2 low?
A deficiency in vitamin D can result from inadequate exposure to sunlight, inefficient production in the skin, not enough vitamin D in your diet, and health conditions that can affect it including, gastrointestinal disorders, renal diseases, and liver diseases.Can vitamin D2 cause weight gain?
Despite these findings, the current body of research suggests that consuming higher amounts of vitamin D has little effect on weight gain or loss.Can I buy vitamin D2 over the counter?
Vitamin D2 (ergocalciferol) is a form of vitamin D that's available both over the counter or with a prescription, depending on the dose. It's used to treat a few different medical conditions that cause or are caused by low vitamin D levels, including hypoparathyroidism (low parathyroid hormone) and rickets.Can you take too much vitamin D2?
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.What is the best vitamin for tiredness?
The 5 Best Vitamins for Energy & Tiredness
- Vitamin B1 (Thiamin) ...
- Vitamin B2 (Riboflavin) ...
- Vitamin B3 (Niacin) ...
- Vitamin B5 (Pantothenic acid) ...
- Vitamin B6 (Pyridoxine)