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.
- Strengthens bones and muscles.
- Boosts immunity.
- Improves mood.
- Reduces inflammation.
- Improves heart function.
In very high doses, many minerals (like iron) and vitamins can harm your body. Current guidelines say adults shouldn't take more than the equivalent of 100 micrograms a day. But vitamin D is a 'fat-soluble' vitamin, so your body can store it for months and you don't need it every day.
There are two possible forms of vitamin D in the human body: vitamin D2 and vitamin D3. Both D2 and D3 are simply called “vitamin D,” so there's no meaningful difference between vitamin D3 and just vitamin D.
Who should not take VITAMIN D3?
- 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.
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.
Despite these findings, the current body of research suggests that consuming higher amounts of vitamin D has little effect on weight gain or loss.
Researchers Say Vitamin D3 Bolsters Immune System Better Than Vitamin D2. Researchers say vitamin D3 bolsters the immune system better than vitamin D2. This goes against previous research that rated both forms of vitamin D about the same.
My Recommended Daily Dose for Vitamin D in Older Adults
For most older adults, I recommend a supplement of vitamin D 1000 IU/day. I do this because: The American Geriatrics Society (AGS) recommends that clinicians tell older patients to take vitamin D 1000 IU/day, to help prevent fractures.
“Supplementing vitamin D can often be helpful since most people are deficient—along with other key nutrients, typically iron, vitamin C, and biotin—in restoring hair loss. It certainly helps thicken existing hair,” Levitan says.
Too much vitamin D can cause harmful high calcium levels. Tell your doctor right away if any of these signs of high vitamin D/calcium levels occur: nausea/vomiting, constipation, loss of appetite, increased thirst, increased urination, mental/mood changes, unusual tiredness.
Vitamin D keeps your immune system strong and can help regulate insulin levels. It keeps your energy levels up and enhances your mood, too.
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.
A: The upper tolerable limit is 4,000 international units (IU) daily, and the recommended amount for women 14 to 70 is 600 IU per day. Women 71 and older should aim for 800 IU per day.
Better Absorbed With Meals
For this reason, it's recommended to take vitamin D supplements with a meal to enhance absorption. According to one study in 17 people, taking vitamin D with the largest meal of the day increased vitamin D blood levels by about 50% after just 2–3 months ( 7 ).
Is there a benefit to taking vitamin D at night? There's been some buzz suggesting a link between supplementing with vitamin D before bedtime and the ability to drift off to dreamland. Some studies have shown that vitamin D is connected to the production of melatonin, which regulates circadian rhythm and drives sleep.
Taking a multivitamin with vitamin D may help improve bone health. The recommended daily amount of vitamin D is 400 international units (IU) for children up to age 12 months, 600 IU for people ages 1 to 70 years, and 800 IU for people over 70 years.
Adults aged up to 70 years old should be getting at least 600 IU. Adults older than 70 should be getting at least 800 IU of vitamin D.
To reduce the risk of infection, it is recommended that people at risk of influenza and/or COVID-19 consider taking 10,000 IU/d of vitamin D3 for a few weeks to rapidly raise 25(OH)D concentrations, followed by 5000 IU/d.
In fact, recent research suggests vitamin D may be far more superior and important to our body than vitamin C. That is not to say you choose between one or the other - both are important. But it has been noted vitamin D is responsible for affecting up to 2,000 different genes (that's one sixth of the human genome).
Taking vitamin D is not a guaranteed guard against the cold or flu. But vitamin D supplements are inexpensive and might give you a boost. Vitamin D: New studies suggest that people with low blood levels of vitamin D are more likely to get sick. Researchers think that vitamin D may play a role in boosting immunity.
"The present data indicate that in obese and overweight people with vitamin D deficiency, vitamin D supplementation aids weight loss and enhances the beneficial effects of a reduced-calorie diet," Vigna's team wrote. The researchers suggest that all overweight and obese people should have their vitamin D levels tested.
Calcium, vitamin B5, vitamin B6, vitamin B12, vitamin B complex, and vitamin C: These provide nutrients that help you function better all around. These also improve metabolism to assist your weight loss: Green tea: Caffeine and catechins in green tea and other products may help with weight management.