Carrot Seed Oil SPF: The Myth and the Research
Last updated July 16, 2026
Carrot seed oil is widely claimed to offer an SPF of 38-40 — a figure repeated across blogs and social media. It is a myth. The number comes from a misread study of a multi-ingredient product, and when carrot seed oil is tested on its own it measures around SPF 1-2.5. Using it as sunscreen is not just ineffective; it is dangerous.
Where the SPF 38-40 Claim Came From
The claim traces to a 2009 paper by Kapoor and Saraf that measured the SPF of finished herbal sunscreen formulations sold in India. One tested product — which contained carrot seed oil alongside other ingredients such as Symplocos and wheat germ — showed an SPF in the high 30s. Over time the SPF of the whole formulation was misattributed to carrot seed oil by itself, and the "SPF 38-40" figure took on a life of its own.
Two ingredients make the confusion worse: "carrot seed oil" refers to two different products — the essential oil (steam-distilled, volatile) and the fixed oil (cold-pressed from the seed) — which have different compositions, and neither was shown to carry a high SPF on its own.
What Proper Testing Actually Shows
Martiniaková et al. (2021)
A 2021 study in Photochemical & Photobiological Sciences evaluated vegetable oils using standardized in vitro and in vivo SPF methods. Carrot seed oil measured about SPF 0.1 in vitro and 2.5 in vivo — a world away from the claimed 38-40, and far too low to offer any real protection.
Reference: Martiniaková et al., Photochemical & Photobiological Sciences, 2021
For context, an SPF of 2.5 blocks roughly 60% of UVB; a usable sunscreen (SPF 30) blocks about 97%. No natural oil — carrot seed included — comes close. Our guide to the highest-SPF natural oils covers how these myths spread and what the research really supports.
Legitimate Uses
Carrot seed oil has real value away from sun protection. It is rich in carotenoids and vitamin E, giving it antioxidant properties, and it is used in aromatherapy and in mature-skin formulations for its scent and skin-conditioning benefits. Used at night or in rinse-off products it is fine; used as a daytime sunscreen it is dangerous, because it invites people to skip real protection.
The Bottom Line
Carrot seed oil is not SPF 38-40. It is roughly SPF 1-2.5, offers no meaningful UV protection, and must never be relied upon as sunscreen. If you want the antioxidant and skincare benefits, use it in the evening — and wear a broad-spectrum SPF 30+ sunscreen during the day.
Our Verdict: 1/5
Carrot seed oil does not have an SPF of 38-40 - that widely repeated claim comes from a misread study of a multi-ingredient formulation. In proper testing, carrot seed oil measures around SPF 1-2.5. Relying on it as sunscreen is dangerous.
Pros
- Rich in carotenoids and vitamin E for antioxidant benefit
- Valued in aromatherapy and mature-skin skincare formulations
- A fixed carrier oil (from the seed) is more stable than the essential oil
Cons
- The famous SPF 38-40 figure is a myth - real testing shows roughly SPF 1-2.5
- Provides no meaningful UVB or UVA protection on its own
- Relying on it as sunscreen risks serious sunburn and UV damage
- Confusion between the essential oil and the fixed (pressed) oil compounds the misinformation
Frequently Asked Questions
Does carrot seed oil have SPF 38-40?
No. Carrot seed oil does not have an SPF of 38-40. That figure traces to a 2009 study that tested a multi-ingredient herbal cream - not carrot seed oil alone. Independent testing of the oil by itself puts its SPF around 1 to 2.5.
What is the real SPF of carrot seed oil?
In a 2021 study using proper SPF methodology, carrot seed oil measured about SPF 0.1 in vitro and 2.5 in vivo - essentially no sun protection. It should never be used as a sunscreen.
Can carrot seed oil be used as sunscreen?
No. At roughly SPF 1-2.5 with no meaningful UVA or UVB protection, carrot seed oil cannot prevent sunburn or UV damage. Use a broad-spectrum SPF 30+ sunscreen instead.
Is carrot seed essential oil the same as carrot seed carrier oil?
No, and the confusion fuels the SPF myth. The essential oil is steam-distilled and volatile; the fixed 'carrier' oil is cold-pressed from the seeds. They have different properties, and neither provides usable sun protection.