Popularly known as the "sunshine" vitamin, Vitamin D is an extremely important component for your body, and it plays a key role in bone health by aiding calcium absorption and bone formation. It also helps in muscle function, nerve transmission, and immune system support. When we talk about Vitamin D, we also often hear of Vitamin D3. But is there any difference between Vitamin D and D3? Let's find out...
Vitamin D
Vitamin D is a group of fat-soluble vitamins that help your body absorb calcium and phosphorus from the food you eat, aiding in a healthy you. These minerals are key to building and maintaining strong bones and teeth. Without enough Vitamin D, bones can become thin, brittle, or break easily.
There are two main forms of Vitamin D:
Vitamin D2 (ergocalciferol)
Vitamin D3 (cholecalciferol)
Both variants help raise the level of Vitamin D in your blood, but they come from different sources, and have slightly different roles in the body.
What Is Vitamin D3?
Vitamin D3, also called cholecalciferol, is the form of Vitamin D that your body makes naturally when your skin is exposed to the sun, specifically ultraviolet B (UVB) rays. It is also found in some animal-based foods like fatty fish, liver, and egg yolks.
Since Vitamin D3 is the form your body produces naturally, it is considered the most effective type of Vitamin D supplement for deficiencies. It raises and maintains Vitamin D levels in the blood better than Vitamin D2, and for a long period of time.
Vitamin D2
Vitamin D2, or ergocalciferol, is made by plants, fungi, and yeast when they are exposed to ultraviolet light. It is also found in some fortified foods and supplements, like those made from plant sources or mushrooms.
Vitamin D2 is slightly less effective than Vitamin D3, and does not spike blood Vitamin D levels as effectively or for as long. However, it is still a good option for people who follow a vegan diet if they can't consume animal supplements.
How do the two work in the body
Both Vitamin D2 and D3 are inactive forms of Vitamin D. After you get Vitamin D from sunlight, food, or supplements, your body converts it into an active form called calcitriol. This active form then travels through your bloodstream, and gives you a host of benefits, such as:
Calcium absorption: It aids your intestines absorb calcium from food, helping in strong bones and teeth.
Bone health: It supports bone growth and repair, reducing the risk of fractures and diseases like rickets in children, and osteomalacia or osteoporosis in adults.
Immune system: Vitamin D helps streamline your immune system, making it easier for your body to fight infections.
Muscle function: It supports healthy muscle function and may help reduce the risk of falls in older adults.
Others: Vitamin D may also play a role in heart health, mood regulation, and reducing inflammation in the body.
Why is Vitamin D important
Vitamin D deficiency is a common occurrence, especially in places where sunlight is sparse, or where people spend most time indoors. Low Vitamin D levels can cause weak bones, muscle weakness, and increase the risk of infections.
Getting enough Vitamin D is important for:
Children’s growth and bone development
Maintaining adult bone strength
Supporting a healthy immune system
Reducing the risk of chronic diseases
Which supplement should you take
Since Vitamin D3 is the form naturally made by your body and is more effective at raising blood Vitamin D levels, most doctors recommend Vitamin D3 supplements for people who need extra Vitamin D.
How to get Vitamin D naturally
You can get Vitamin D from:
Sunlight: Spending about 10-30 minutes in the sun each day (7 am - 8 am) helps your skin make Vitamin D3. You can soak in the morning sun without sunscreen on your arms and legs, but do cover your face.
Food: Fatty fish (like salmon and mackerel), egg yolks, fortified milk, and cereals provide Vitamin D.
Risk factors
Vitamin D is generally safe when taken in recommended amounts. However, too much Vitamin D can cause side effects like nausea, weakness, and kidney problems because it raises calcium levels too high.
Always consult a doctor before adding any supplements to your diet.
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