Studies have found that even when used at maximum recommended amounts, sunscreen does not lead to lower vitamin D levels.
Does Sun Protection Block Vitamin Gains?
High SPF, broad-spectrum sunscreen filters out most of the sun's UBV radiation. Despite this, clinical studies suggest that everyday sunscreen use does not appear to lead to vitamin D deficiency.
This may be because even with perfect use of high SPF sunscreen, some UVB from the sun still reaches the skin, and it doesn't take a lot of sun exposure to trigger the body to produce vitamin D.
Some studies suggest that sunscreen blocks UVA (which may cause vitamin D degradation), so sunscreen may benefit vitamin D production.
How Sunscreen Works
Sunscreen protects your skin by blocking or absorbing the sun’s ultraviolet (UV) radiation, which can damage skin cells and increase the risk of skin cancer.
- There are two main types of UV rays:
- UVA: Penetrates deeply and contributes to skin aging.
- UVB: Primarily responsible for sunburn and also plays a role in skin cancer development.
Most sunscreens use either chemical filters (like avobenzone or oxybenzone) that absorb UV rays and convert them into harmless heat, or mineral filters (like zinc oxide or titanium dioxide) that act as a physical shield, reflecting rays away from the skin. Many modern formulas combine both for broad-spectrum protection.
The Sun Protection Factor (SPF) on a sunscreen label mainly refers to protection against UVB rays.
A higher SPF means better defense, though no sunscreen can block 100% of UV rays. Regular, even application and reapplication—especially after swimming or sweating—are key to keeping your skin protected.
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Other Factors That Influence Vitamin D Levels
Several factors beyond sunscreen affect how much vitamin D your body can produce from sunlight:
- Geography and season: Living farther from the equator or in places with long winters reduces vitamin D production.
- Time of day: Midday sun provides the strongest UV rays for vitamin D synthesis.
- Skin tone: Darker skin has more melanin, which lowers the skin’s efficiency in making vitamin D.
- Age: Older adults produce less vitamin D because their skin is thinner.
- Lifestyle habits: Spending more time indoors, covering up with clothing, or wearing hats and sunglasses all limit UV exposure.
These factors often explain low vitamin D levels more than sunscreen use alone.
Precautions With Vitamin D
It is possible to get too much vitamin D, which can be harmful. High vitamin D levels are usually caused by excessive vitamin D supplement intake. Very high blood levels of vitamin D may cause:
- Nausea
- Vomiting
- Confusion
- Pain
- Muscle weakness
- Loss of appetite
- Dehydration
- Excessive urination
- Excessive thirst
- Kidney stones
Extremely high levels of vitamin D may cause toxicity and can lead to severe effects or be fatal.
Vitamin D supplements may also interact with some medications or other supplements.
Talk to your healthcare provider before taking vitamin D supplements.
Bias in Studies
It needs to be noted that much of the research on sunscreen use and vitamin D has been conducted on participants with lighter skin pigmentation. More research is needed on the effects of sunscreen on vitamin D production for people with darker skin pigmentation.
