On Your Makeup, 'Broad Spectrum' Beats the SPF Number
Your foundation's SPF number only tells half the story — 'broad spectrum' is the label term that decides whether it fights aging UVA at all.
SPF only measures UVB (sunburn) protection; 'broad spectrum' is what indicates a product also guards against UVA rays that cause aging and contribute to skin cancer — and many cosmetics fall short on UVA.
Dermatologists recommend selecting products labeled 'broad spectrum,' explaining that SPF alone reflects only UVB defense, while UVA protection is what guards against photoaging and adds to a product's skin-cancer protection.
Questions we get a lot
What does 'broad spectrum' mean on sunscreen or makeup?
'Broad spectrum' indicates that a product protects against both UVA and UVB rays. SPF on its own measures only UVB, the ray that causes sunburn. UVA contributes to aging and skin cancer, so broad-spectrum coverage is important.
Is the SPF in my makeup enough sun protection?
Often not. The SPF number reflects only UVB protection, and many cosmetics fall short on UVA. Look for 'broad spectrum' on the label, and apply enough product to actually reach the labeled SPF. For reliable daily protection, a dedicated broad-spectrum sunscreen under makeup is a safer bet.
r/MakeupAddiction: 'My foundation has SPF 30 — is that enough sun protection, or do I still need separate sunscreen?'