Question 1 of 6
On a typical day, how much time do you spend outside?
Why we ask: Your skin makes vitamin D when UVB sunlight hits it — but only when UVB is strong enough, and only from skin that’s actually exposed. We factor in the current season, typical UK cloud cover, and how much skin you’re likely to have out right now.
Question 2 of 6
Which of these do you eat at least once a week?
Why we ask: Very few foods naturally contain significant vitamin D. The best sources are oily fish, egg yolks, and liver — but even eating them regularly only covers a fraction of what most people need. We estimate your weekly dietary intake based on a typical portion of each food you select.
Select all that apply
Question 3 of 6
When did you last escape somewhere properly sunny?
Why we ask: A fortnight in the Canaries does more for your vitamin D than an entire British summer. Destinations closer to the equator have a UVB index up to six times higher than the UK, and warmer weather means more skin is actually out in the sun. The boost is real — but it fades within a few weeks of coming home.
Question 4 of 6
How old are you?
Why we ask: As we age, our skin becomes significantly less efficient at synthesising vitamin D from sunlight. By your 60s, your skin produces up to four times less vitamin D than it did in your 20s — even with identical sun exposure. Age is one of the strongest independent predictors of low vitamin D status.
Question 5 of 6
Do you carry more body fat than you’d like?
Why we ask: Vitamin D is fat-soluble, meaning it gets stored in fatty tissue rather than circulating freely in the blood. In people with higher body fat, more vitamin D is sequestered in fat cells and becomes unavailable where it’s needed. Research consistently links higher body fat with lower circulating vitamin D — regardless of how much sun someone gets.
Question 6 of 6
Do you have African, Middle Eastern, or South Asian heritage?
Why we ask: Melanin — the pigment that gives skin its colour — acts as a natural filter for UVB rays. In high-sun environments this is protective, but in lower-latitude countries like the UK it means people with darker skin tones need significantly more sun exposure to produce the same amount of vitamin D. Studies consistently find much higher rates of deficiency among people of African, Middle Eastern, and South Asian descent living in Northern Europe.
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Your estimated vitamin D levels throughout the year
WHY SOLMATE
Most vitamin D supplements are poorly absorbed. Solmate’s Daily Sunshine uses an advanced emulsion that mimics how vitamin D behaves in food — so your body absorbs significantly more of every drop. No tablets, no capsules. Just a few drops a day in water, coffee, or food.
Try Daily Sunshine →This quiz is for educational purposes only. It is not intended to diagnose vitamin D deficiency or constitute medical advice. Projected levels are estimates based on lifestyle factors associated with vitamin D status and should not be used as a substitute for clinical assessment. The only way to confirm your vitamin D levels is through a blood test measuring 25(OH)D. If you have concerns, please speak to your GP or a qualified healthcare provider.