The foundations of healthy glowing skin - Part 2 Why Sunscreen is a must
Sun protection is one of the most researched, scientifically proven ways to prevent premature ageing and protect long-term skin health. While moisturising strengthens the skin barrier, SPF protects that barrier from the most significant external cause of damage: ultraviolet radiation.
This post explores how SPF works, the difference between chemical and mineral sunscreens, and the evidence supporting zinc oxide as a safer, more effective option, especially for sensitive, hormonal, and pregnancy/postpartum skin.
How UV radiation damages the skin
Dermatology research separates UV damage into two categories:
UVA (ageing rays)
- Penetrate deeply into the skin
- Break down collagen and elastin
- Cause wrinkles, sagging, and pigmentation
- Present all year, even through clouds and windows
UVB (burning rays)
- Responsible for sunburn
- Cause redness, inflammation, and surface-level damage
- Play a major role in skin cancer risk
Both UVA and UVB accelerate oxidative stress, increase inflammation, and worsen conditions like melasma, which commonly appears during pregnancy or hormonal shifts.
Daily SPF use is supported by decades of clinical studies showing reduced signs of ageing, improved skin tone, and better long-term barrier health.
Does SPF protect from pollution too?
SPF was created to filter UV light, not pollution particles.
However, it still helps your skin more than you might think.
Pollution particles (especially microscopic ones like PM2.5) cling to the skin and trigger inflammation and free radical damage. On their own, these particles age the skin but when UV is added to the mix, that damage accelerates significantly.
SPF helps in several indirect but important ways:
1. It prevents UV from activating pollutants on the skin
UV light interacting with pollution creates free radicals, the molecules that damage collagen and make pigmentation worse. SPF reduces this chain reaction.
2. It creates a lightweight protective film on the skin
This film helps limit how deeply pollution particles settle.
3. Many modern SPFs include antioxidants
These antioxidants neutralise free radicals triggered by both UV and pollution.
4. It reduces inflammation caused by environmental stress
A protected skin barrier is more resilient, calmer, and less reactive.
So while SPF doesn’t “filter” pollution on its own, it does reduce the total impact that pollution has on your skin especially when combined with antioxidant-rich ingredients like vitamin C.
A strong skin barrier can only stay healthy if you protect it from UV damage. (Mineral) sunscreen not only reduces the long-term effects of sun exposure, but also supports hormonal, sensitive, and reactive skin types, without unnecessary irritation. If you want smoother texture, fewer fine lines, and a brighter complexion, daily SPF is essential. Sunscreen is not just a final step; it’s the foundation of skin longevity.
Looking for a moisturiser with SPF that is lightweight and natural? At Siren we're all about a natural, healthy glow. Be on the lookout for our next drop here
