Many of our customers who call about sunscreens are looking for Mexoryl XL but we‘ve noticed
a growing number who also want a product that includes Tinosorb S, a newer chemical sun filter that
blocks both UVA rays and UVB rays. Not all sunscreens are made equal, and while we may be familiar
with the SPF rating, which is indicative of UVB protection against sunburns, it’s important to
understand how UV radiation damages our skin and what we should do to protect ourselves against
more than just sunburns.
UV radiation can be divided into wavelength ranges identified as UVB (280 to 315 nm), UVA (315 to
400 nm) and UVC (100-280 nm). UVC rays tend to burn off before they reach the earth’s atmosphere
so it’s the UVA and UVB rays that we are concerned about. Summer sun carries both UVA (Aging) and
UVB (Burning) rays. When the temperatures drop in the winter, UVB rays diminish, but UVA rays
persist. UVA rays are prevalent year round and able to penetrate the ozone layer, clouds and windows,
day in day out. Unlike overexposure to UVB rays which results in tans and sunburns, the longer UVA
rays penetrate the skin more deeply without any immediate signs, contributing to long-term skin
damage such as wrinkles, discoloration, sagging and some forms of skin cancer. In fact, the damage that
UVA rays can cause may not be evident for decades.
With all that in mind, we’ve got 5 excellent reasons why you may be looking for Tinosorb S in your
- It blocks UV radiation from 280 nm to 400 nm, essentially covering both UVA and UVB ranges.
- It’s photostable, meaning it’s resistant to breaking down from light exposure. This ensures that
it will continue to offer protection over time.
- Tinosorb S helps stabilize other sun filters such as avobenzone from degradation. Avobenzone
is a widely used ingredient that blocks UVA rays up to 370 nm but must be stabilized with other
sun filters to maintain its effectiveness. Without the help of these other stabilizing sun filters,
avobenzone breaks down after 30 minutes of sun exposure, leaving your skin vulnerable to
- It isn’t associated with skin irritation or hormone disruption like some older sun-filtering
- When Tinosorb S is used in combination with other sun filters, Tinosorb S adds one more layer
of protection against both UVA and UVB rays, an advantage that melanoma survivors are
acutely aware of. Tinosorb S is compatible in formulations containing Mexoryl XL and SX and
complements their effectiveness particularly at protecting against those long UVA rays that
penetrate deeper into the skin. And with the addition of UVB absorber Univul T,
Tinosorb S’s SPF powers are further boosted.
At the risk of being a name dropper, we think that if the director of the melanoma program at the Stanford Cancer Institute likes Tinosorb S, that’s good enough for us.
Check out our current line of sunscreens with Tinosorb S here.