Living somewhere sunny does not tell you your vitamin D status. Neither does spending a day indoors. Individual circumstances matter more than a rule of thumb.
Start with the job vitamin D does
Vitamin D helps the body absorb calcium and supports bones, muscles and nerve function. The NHS also describes its role in regulating calcium and phosphate. It is therefore part of a wider nutritional picture, not an isolated “sunshine fix”. Adequate vitamin D is important, but that does not mean taking extra will improve every aspect of health. [1] [2]
Why a sunny postcode is not a measurement
Skin can make vitamin D with sunlight exposure, but production varies with factors including age, skin pigmentation, cloud cover and air pollution. Sunlight through glass does not produce the same effect. NIH also cautions that UV exposure carries skin-cancer risks. A universal instruction to spend a fixed number of unprotected minutes in the sun would ignore those differences. [1]
Food labels can change the conversation
Oily fish and egg yolks provide vitamin D; some foods have it added. Fortification differs between products and countries. The NHS, for example, notes that UK cows’ milk is generally not fortified, while NIH describes widespread US milk fortification. Neither fact tells you what is in a carton sold in India. Read the specific Indian product label rather than importing an assumption from another country. [2] [1]
Understand the units before comparing packs
Vitamin D may be listed in micrograms or international units: 1 microgram equals 40 IU. This is a conversion, not a personalised daily-dose recommendation. Two packs can display different-looking numbers for the same amount. Check whether the number refers to one tablet, one gummy or the full daily serving before comparing them. [2]
More is not a better long-term strategy
Too much vitamin D from supplements can raise calcium levels excessively and harm the body. The NHS cautions against prolonged excessive intake. Keep routine supplementation separate from a clinician-directed treatment course: instructions written for one person or one period should not become a household default. Do not copy someone else’s prescription or continue a high-dose course without review. [2]
Prepare for an individual decision
If you are concerned, record your usual diet, current supplements and any previous test or treatment advice. Ask whether assessment or testing is appropriate for your situation and how any result would change the plan. Also ask when a recommended course should be reviewed. A clear follow-up question is more useful than repeatedly changing brands in search of a stronger number on the label.
Keep international guidance in context
The sources below explain vitamin D biology and safety, but some recommendations are specific to the UK or US. For use in India, follow the applicable product directions and professional advice rather than adopting another country’s seasonal supplement schedule. This article deliberately does not assign one daily dose to every reader.
Three things to take away
- Check whether your foods are actually fortified.
- Compare the same units and the same serving size.
- Review dose, duration and overlapping products with a professional.
Sources & further reading
Sources consulted 26 October 2026. International references explain nutrition and evidence; country-specific intake recommendations should not be treated as Indian prescribing guidance.
General education, not personal medical advice or evidence of a benefit from any RUHVAYA product. For product-specific directions, read the label and our disclaimer.