Vitamin D3
The sunshine vitamin. Over 70% of Indians are deficient due to indoor lifestyles and darker skin tones requiring more sun exposure for synthesis.
Pharmacists & Nutrition Researchers · Updated March 2026
1000–4000 IU
Dosage
morning
Timing
Strong
Evidence
2 cited
Studies
Benefits of Vitamin D3
Essential for calcium absorption and bone health
Supports immune system function
May improve mood and reduce depression risk
Supports muscle function
May reduce risk of respiratory infections
How Vitamin D3 Works
Vitamin D3 (cholecalciferol) is converted to its active form 25(OH)D in the liver, then to 1,25(OH)2D in the kidneys. It acts as a hormone, regulating calcium absorption, immune cell function, and gene expression in over 200 genes.
Recommended Dosage
Take with a fat-containing meal for best absorption. D3 (cholecalciferol) is more effective than D2 (ergocalciferol). Pair with Vitamin K2 for optimal calcium metabolism.
Who Should Avoid Vitamin D3
Key Research
Prevalence of Vitamin D deficiency in India (2018)
76% of urban Indians were Vitamin D deficient (<20 ng/mL)
DOI: 10.1007/s12291-018-0767-yVitamin D and respiratory tract infections (2017)
Supplementation reduced acute respiratory infections by 12% overall, 70% in severely deficient
DOI: 10.1136/bmj.i6583Recommended Vitamin D3 Brands in India
Carbamide Forte Vitamin D3 K2 Supplement
Carbamide Forte
"Combines D3 with K2 (MK-7) for optimal calcium metabolism. Carbamide Forte is a reliable Indian brand with transparent labelling."
Carbamide Forte Vitamin D3 K2 Supplement
Carbamide Forte
"Combines D3 with K2 (MK-7) for optimal calcium metabolism. Carbamide Forte is a reliable Indian brand with transparent labelling."
Products are selected based on quality, testing, and purity — not affiliate economics. See our selection criteria.
Works Well With
Frequently Asked Questions
What is Vitamin D3 used for?
The sunshine vitamin. Over 70% of Indians are deficient due to indoor lifestyles and darker skin tones requiring more sun exposure for synthesis.
What is the recommended dosage of Vitamin D3?
The clinically studied dosage range is 1000–4000 IU per day. Take with a fat-containing meal for best absorption. D3 (cholecalciferol) is more effective than D2 (ergocalciferol). Pair with Vitamin K2 for optimal calcium metabolism.
When is the best time to take Vitamin D3?
Vitamin D3 is best taken in the morning. Take with a fat-containing meal for best absorption. D3 (cholecalciferol) is more effective than D2 (ergocalciferol). Pair with Vitamin K2 for optimal calcium metabolism.
Is Vitamin D3 safe?
Vitamin D3 is generally considered safe at recommended dosages. However, it may be contraindicated for: Hypercalcemia, Kidney stones history (use with caution), Sarcoidosis, Granulomatous diseases. Always consult a healthcare professional before starting any supplement.
Is Vitamin D3 vegetarian?
Vitamin D3 supplements are available in vegetarian form. Check the specific product label for capsule ingredients.
Can I take Vitamin D3 with other supplements?
Be aware of these interactions: Thiazide diuretics may increase calcium levels when combined with D3. Corticosteroids may reduce D3 absorption. Cholestyramine and orlistat reduce absorption
Is Vitamin D3 right for you?
Take our assessment and get a personalized supplement plan based on your goals and health profile.
Start Assessment