Tanning beds can produce vitamin D — but whether yours actually does depends almost entirely on the type of bed you’re using. Most commercial salon beds are engineered for cosmetic tanning, which means they’re dominated by UVA light. UVA does not trigger vitamin D synthesis in the skin. UVB does. And most high-pressure salon beds deliver very little of it.

The short answer: low-pressure tanning beds with a meaningful UVB output can raise vitamin D levels, and research confirms this. High-pressure beds, which are common in higher-level salon packages, produce almost no vitamin D at all. And even with the right type of bed, most dermatology organisations still recommend supplements over tanning beds as a safer, more reliable way to address a deficiency.

Here’s what the science actually says — and what it means for your tanning routine.

Key Takeaways

Vitamin D production in the skin requires UVB rays. UVA rays, which dominate most tanning beds, do not stimulate vitamin D synthesis.
Low-pressure tanning beds emit roughly 25% UVB and can raise vitamin D levels. High-pressure beds emit up to 99% UVA and provide almost no benefit for vitamin D.
Research shows that regular use of UVB-emitting sunbeds can raise 25(OH)D levels from winter lows to typical summer values.
Most salon-level tanning beds (Level 3 and above) are high-pressure and largely useless for vitamin D production.
The recommended daily intake of vitamin D is 600 IU for adults and 800 IU for those over 70, according to the NIH.
Vitamin D supplements are considered safer and more reliable than tanning beds for correcting a deficiency, according to dermatology guidelines.
Skin type, session duration, time of year, and UVB percentage all affect how much vitamin D you actually get from a tanning bed.

How Does the Body Make Vitamin D?

Vitamin D isn’t absorbed through the skin — it’s manufactured there. When UVB rays (wavelengths between 280–315 nm) hit the skin, they react with a compound called 7-dehydrocholesterol. This triggers a conversion process that produces previtamin D3, which is then converted by body heat into vitamin D3 (cholecalciferol). That compound travels to the liver and kidneys, where it’s converted into the active hormone form the body uses.

The key takeaway here is that UVB is the trigger. Without sufficient UVB in the light source, the chain reaction doesn’t start — and no meaningful vitamin D is produced. This is why glass windows block vitamin D production (glass filters UVB), and why the time of day and season matter so much for outdoor sun exposure. It’s also why the type of tanning bed matters enormously.

High-Pressure vs Low-Pressure Beds: The Vitamin D Difference

Not all tanning beds work the same way, and the distinction between high-pressure and low-pressure bulbs is the most important factor when it comes to vitamin D.

Low-Pressure Beds (Level 1–2)

Low-pressure beds use long fluorescent-style lamps that emit a mix of both UVA and UVB light. The typical ratio is around 75% UVA to 25% UVB. This UVB component is what makes vitamin D production possible. These are usually the entry-level beds in a salon — longer session times, lower intensity — and they’re the beds most commonly used in research studies investigating tanning beds and vitamin D.

High-Pressure Beds (Level 3–6)

High-pressure beds use compact quartz lamps that are filtered to emit primarily UVA light. Depending on the model, they can emit 95% to 99% UVA with virtually no UVB. These beds produce a faster, deeper, longer-lasting cosmetic tan — but they do almost nothing for vitamin D. If you’re paying a premium for a higher-level bed at your salon, you’re getting a better tan, not better vitamin D synthesis.

This distinction is frequently missing from conversations about tanning beds and vitamin D, and it’s why the topic generates so much confusion. Blanket statements like “tanning beds boost vitamin D” are only half true — and only for a specific type of bed.

What the Research Actually Shows

There is solid evidence that low-pressure, UVB-emitting tanning beds can raise vitamin D levels. The question is whether that benefit outweighs the risks — and most health authorities say it doesn’t.

A randomised controlled trial published in 2008 tested the effect of sunbed sessions emitting either 0.5% or 1.4% UVB on serum 25-hydroxyvitamin D levels. Both groups showed significant increases compared to the control group, with the 1.4% UVB group responding more strongly. The study noted that vitamin D levels plateaued after a few sessions and that a significant proportion of sessions caused skin redness or other side effects. The researchers concluded that while sunbeds can produce vitamin D, they are not generally recommendable as a source due to carcinogenicity and acute side effects. [Snellman et al., Photodermatology, Photoimmunology & Photomedicine, 2009]

A 12-week study using standardised sunbed exposure schedules found that participants using low-pressure fluorescent lamps (100W and 160W) showed continuous increases in 25(OH)D levels throughout the study period, reaching physiologically meaningful levels. Importantly, high-pressure sunbed participants showed no comparable increase — reinforcing the point that UVB content is the deciding factor. [Slusher et al., Dermato-Endocrinology, 2018]

A separate study found that sunbed sessions raised 25(OH)D levels from typical winter values to typical summer values — an average increase of around 15 nmol/L. Participants with the lowest baseline vitamin D levels showed the greatest response. However, the induced increase was temporary: levels returned to pre-exposure baseline within 2–4 weeks of stopping. [Thieden et al., Photochemical & Photobiological Sciences, 2009]

The research picture is consistent: UVB sunbeds can raise vitamin D levels, the effect is real, but it’s temporary, type-dependent, and comes with a risk profile that most dermatologists find hard to justify.

How Much Vitamin D Can You Actually Get?

This depends on several variables working together:

UVB output of the bed. Without sufficient UVB, virtually nothing happens. Aim for a bed with at least 5% UVB output if you’re in North America.
Session length and frequency. Longer and more frequent sessions produce more vitamin D, up to a point. Very short sessions in low-UVB beds will have a minimal effect.
Skin type. Lighter skin synthesises vitamin D more efficiently from the same UV exposure. People with darker skin tones require longer exposure to produce the same amount.
Body surface area exposed. The more skin exposed, the greater the total vitamin D production. A full-body session will produce significantly more than one where most of the body is covered.
Starting vitamin D level. Research consistently shows that people with the lowest baseline levels respond most strongly to UV exposure. Those already at adequate levels see smaller gains.

A standard session on a low-pressure bed can raise vitamin D levels meaningfully, particularly in winter when sun exposure is limited. But it won’t resolve a clinical deficiency on its own — and it won’t sustain elevated levels if sessions stop.

The Safer Alternatives

Most dermatologists, including those at the American Academy of Dermatology, recommend against using tanning beds specifically for vitamin D. Their position is that no safe UV threshold for skin cancer risk has been established, and supplements offer the same vitamin D benefit without the exposure risk.

Supplements

The NIH recommends 600 IU of vitamin D per day for adults aged 1–70, and 800 IU for those over 70. For people with a confirmed deficiency, doctors typically prescribe higher doses — often 50,000 IU weekly for 6–8 weeks, followed by a maintenance dose. Vitamin D3 supplements are widely available, inexpensive, and well-tolerated by most people. They’re the most reliable way to consistently hit your target level.

Diet

Food sources of vitamin D include oily fish (salmon, mackerel, sardines), egg yolks, beef liver, and fortified foods such as milk, plant-based milks, and breakfast cereals. Diet alone is rarely sufficient to meet daily requirements, particularly in northern latitudes during winter, but it makes a useful contribution alongside supplements.

Sunlight (When Available)

Natural sunlight remains the most efficient source of vitamin D. In summer, fair-skinned individuals can synthesise around 1,000 IU from just a few minutes of midday sun exposure with arms and legs uncovered. For darker skin tones, longer exposure is needed to produce the same amount. Sunlight is obviously not a reliable option in winter months at higher latitudes — which is precisely when vitamin D deficiency tends to peak.

For more on UV and how it affects your skin outdoors, see our guide on what UV index is best for tanning.

Frequently Asked Questions

Do all tanning beds produce vitamin D?

No. Only tanning beds that emit sufficient UVB radiation can stimulate vitamin D synthesis. High-pressure beds, which produce up to 99% UVA, provide almost no vitamin D benefit. Low-pressure beds (typically Level 1–2 in a salon) emit around 25% UVB and can raise levels meaningfully.

How long do I need to tan to produce vitamin D?

In a low-pressure bed with adequate UVB output, a standard session of 10–20 minutes can produce a meaningful increase in vitamin D. However, the exact amount depends on your skin type, the specific bed’s UVB output, and how much of your body is exposed. There’s no precise formula that applies universally.

Can a tanning bed fix a vitamin D deficiency?

It can help, but it’s not the recommended approach. A clinical vitamin D deficiency is typically addressed with prescription-level supplementation. Using a tanning bed regularly on a low-pressure setting might help maintain levels during winter, but it won’t reliably correct a deficiency — and comes with skin cancer risk. A blood test and discussion with your doctor is the right first step if you suspect a deficiency.

Does a higher-level tanning bed produce more vitamin D?

No — the opposite is usually true. Higher-level beds use high-pressure lamps that emit almost exclusively UVA and very little UVB. For vitamin D production, a Level 1 or Level 2 low-pressure bed is more effective than a Level 4 or 5 high-pressure bed.

Will my tan from a tanning bed still produce vitamin D?

Not necessarily. The tan itself doesn’t produce vitamin D — the UVB rays do. A dark tan from a high-UVA bed gives you colour without vitamin D. The two processes are largely independent, which is why knowing the bed type matters so much.

Is it safe to use a tanning bed for vitamin D in winter?

Some people do use low-pressure tanning beds during winter months to maintain vitamin D levels, and research supports that it works. However, dermatology guidelines consistently recommend supplements as a safer alternative. If you’re going to use a tanning bed for this purpose, low-pressure beds with sufficient UVB, short session times, and proper protective eyewear are essential. See our tanning bed tips for beginners for safe session guidance.

Can I get enough vitamin D from a 5-minute session?

Possibly, depending on the bed. Research suggests short sessions on high-UVB beds can produce meaningful vitamin D — one study referenced vitamin D synthesis equivalent to roughly 30 minutes of midday sun from a 20-minute session on an appropriate bed. A 5-minute session will produce some, but probably less than you’d hope. For reference, check our tanning bed time chart to understand session lengths relative to skin type.

Conclusion

Tanning beds can produce vitamin D — but only the right kind, and only under the right conditions. If you’re using a high-pressure salon bed for a fast, deep tan, you’re almost certainly not getting any meaningful vitamin D benefit. If you’re using a low-pressure bed with genuine UVB output, you likely are raising your levels, though the effect is temporary and needs to be maintained with regular sessions.

For most people, the more practical route is a daily vitamin D3 supplement, particularly through the winter months. It’s consistent, risk-free, and doesn’t require you to book a salon appointment. If you prefer to keep tanning — and there’s nothing wrong with that — just know that for vitamin D specifically, the type of bed matters far more than the length of the session.

If you’re exploring alternatives to traditional UV tanning altogether, our guide to hybrid tanning beds covers how red light therapy and UV are being combined in newer machines.

References

Snellman E, et al. Sunbed radiation provokes cutaneous vitamin D synthesis in humans — a randomised controlled trial. Photodermatology, Photoimmunology & Photomedicine, 2009. — Randomised study showing that sunbeds emitting 0.5% and 1.4% UVB both raised 25(OH)D levels in women, with responses plateauing after several sessions. Noted a high frequency of skin side effects.
Slusher AL, et al. Sunbeds with UVB radiation can produce physiological levels of serum 25-hydroxyvitamin D in healthy volunteers. Dermato-Endocrinology, 2018. — 12-week trial finding that low-pressure fluorescent sunbeds produced continuous increases in vitamin D, while high-pressure beds produced no comparable increase.
Thieden E, et al. Sunbeds as vitamin D sources. Photochemical & Photobiological Sciences, 2009. — Found that sunbed sessions raised 25(OH)D from winter lows to summer values, with the greatest response in those with the lowest baseline levels. Levels returned to pre-exposure values within 2–4 weeks of stopping.
NIH Office of Dietary Supplements — Vitamin D Health Professional Fact Sheet. — Reference source for recommended daily intakes of vitamin D by age group (600–800 IU for adults).