Seed Oils Have No Meaningful SPF. Here's What the Data Shows.

A claim that will not die: raspberry seed oil has an SPF of 28 to 50. It shows up in DIY sunscreen communities, natural skincare blogs, and wellness TikTok. It is wrong. Here is where the number came from, what the actual data shows, and what the distinction means if you care about what you put on your skin.

Where the Claim Comes From

The raspberry seed oil SPF claim traces to a 2000 study by Oomah et al. published in Food Chemistry. The study measured the photoprotective potential of berry seed oils using spectrophotometry, measuring UV absorbance of the oil in isolation in a machine. That is not SPF testing. SPF is measured on human skin under standardized FDA protocols involving trained panelists and minimum erythema dose measurements. The Oomah study measured one physical property of an oil. That number was misquoted, misapplied, and repeated until it became widely believed fact.

What Real Testing Shows

When seed oils are tested under actual SPF protocols, the numbers are not meaningful. Most tests find SPF values between 1 and 7. A 2020 study in the Journal of the American Academy of Dermatology tested 15 homemade sunscreen recipes and found every single one tested below SPF 6, recipes that often included seed oils specifically for their claimed SPF properties.

The Swellies founder tested a DIY zinc oxide formula with a seed oil base at an FDA-approved lab. Static SPF: 16. After 40-minute water resistance testing: SPF 7. That formula contained 25% zinc oxide and still failed because the formulation was wrong. Seed oils as the base compound the dispersion problem rather than solve it.

Why Seed Oils Don't Work as UV Filters

UV protection comes from FDA-approved active ingredients, substances specifically designed to absorb or scatter UV radiation in a controlled, tested way. Zinc oxide and titanium dioxide are the two mineral actives confirmed by the FDA as generally recognized as safe and effective. Seed oils are not on that list. They are not UV filters.

The antioxidant properties of some seed oils are real, antioxidants can mitigate some UV-induced free radical damage, but antioxidant activity is not UV filtration. These are different mechanisms, and confusing them is what produced the misread raspberry seed oil claim in the first place.

If You're Avoiding Chemical Sunscreen, Here's the Actual Answer

The concern driving seed oil SPF claims is usually valid: distrust of chemical sunscreen actives. The FDA has requested safety data on 12 of 16 chemical actives. That data has not arrived. Systemic absorption studies have detected several chemical actives in blood after typical use.

But the answer to chemical sunscreen is not raspberry seed oil. It is zinc oxide. Zinc oxide is FDA Category I, confirmed safe and effective. It does not absorb into the bloodstream. In a properly formulated sunscreen like Swellies, 21% non-nano zinc oxide delivers SPF 46 with no white cast and no seed oils in the formula.

Frequently Asked Questions

Does raspberry seed oil have SPF?

No meaningful SPF. The claim traces to a misread spectrophotometry study, not SPF testing. Real-world testing of seed oils finds values of SPF 1 to 7. Swellies uses 21% non-nano zinc oxide, the FDA-confirmed active, lab-tested at SPF 46. No seed oils.

Are seed oils safe for skin?

Most seed oils are not harmful in small amounts. But they are not UV filters, and using them as natural SPF is not supported by testing data. For someone avoiding chemical sunscreen actives, seed oils do not solve the problem. Zinc oxide does.

What is the safest natural sunscreen?

Mineral sunscreen with zinc oxide as the only active. Zinc oxide is one of two actives the FDA has confirmed as generally recognized as safe and effective. Swellies uses 21% non-nano zinc oxide with no chemical actives, no seed oils, and five readable ingredients, lab-tested at SPF 46.

What should I use instead of seed oil sunscreen?

Swellies. Five ingredients, 21% non-nano zinc oxide, coco caprylate/caprate, dextrin palmitate, polyhydroxystearic acid, iron oxides. No seed oils, no chemical actives. Lab-tested SPF 46, broad spectrum, water resistant 40 minutes.

Does carrot seed oil have SPF?

No. Carrot seed oil is often cited with an SPF of 38 to 40, a number that originates from the same category of error as the raspberry seed oil claim: spectrophotometry readings misread as SPF values. SPF is measured on human skin under FDA-standardized protocols. Carrot seed oil has not passed those tests. It is not an approved UV filter. It is an antioxidant-rich oil with no meaningful sun protection. For someone looking for a natural, chemical-free option, the answer is not carrot seed oil. It is zinc oxide, the only single mineral active confirmed by the FDA as safe and effective for full UVA and UVB protection.