Gabriel Mojay via Body Unburdened
June 20, 2014 · Edited ·
Today I looked at the full paper of the study that has wrongly led people to make the claim that raspberry seed oil has a sun protection factor (SPF) of 28-50. The abstract of the paper is here:
The relevant passage in the paper itself reads: “The optical transmission of raspberry seed oil, especially in the UV range (290±400 nm) was comparable to that of titanium dioxide preparations with sun protection factor for UV-B (SPF) and protection factor for UV-A (PFA) values between 28±50 and 6.75±7.5, respectively (Kobo Products Inc., South Plainfield, NJ).”
Ultraviolet B (UV-B) rays are largely absorbed by the ozone layer. Ultraviolet A (UV-A) rays are those we need protection from – because they are not absorbed by the ozone layer. On this basis, the SPF of raspberry seed oil is more accurately 6.75 to 7.5… probably SPF 8 at the most.
skincancer.org advises: “Use a broad spectrum (UV-A/UV-B) sunscreen with an SPF of 15 or higher every day. For extended outdoor activity, use a water-resistant, broad spectrum (UV-A/UV-B) sunscreen with an SPF of 30 or higher.” The US FDA defines the phrase “broad spectrum” as having a UV-A SPF at least as high as the UV-B SPF. Raspberry seed oil therefore provides inadequate protection on its own.