The "Safe Partner." Why Hyaluronic Acid is the dermatologist's top pick for post-LED hydration.
Reviewed by GlowLab Safety Team
This guide is compiled from dermatologist commentary, user experience patterns, and UK clinical safety protocols.
Last Updated: 30 January 2026
Note: This content is for general education only and not medical advice.
We use Perplexity to gather real-world user patterns from Reddit and YouTube dermatologists, cross-checking all advice against UK dermatology clinic guidance. We analyse device heat issues and strap-pressure failures to prioritise safety over marketing claims.
If you are starting out with LED, Hyaluronic Acid is likely the best first serum to introduce.
Even with "safe" ingredients, the physics of a mask can cause issues:
Simple is best to ensure maximum light penetration.
Best for: Maximising results and avoiding sticky mess.
Best for: Dry skin that feels tight during treatment.
Note: Ensure serum is water-clear, not opaque.
The Cause: The HA hasn't absorbed, or the mask is trapping humidity.
The Fix: Switch to "LED First" method. Use the mask on completely dry, bare skin.
The Cause: Likely "occlusive folliculitis" or heat rash from heavy product + occlusion.
The Fix: Wash mask thoroughly, ensure skin is bare during use, and use a lighter moisturiser afterwards.
Not all textures play well with silicone masks.
Best ChoiceFast Absorption Lightweight Serum | GoodLayer After Thick Essence/Toner | Avoid Under MaskOcclusive Heavy Cream/Balm | |
|---|---|---|---|
| Under Mask Safety | High (if dried down) | Moderate (can be sticky) | Low (traps heat/sweat) |
| Best Application Time | After LED (or thin layer before) | After LED | Strictly After LED |
| Risk of Pilling | Low | Moderate | High |
Yes, it is widely considered the safest ingredient to combine with light therapy. Unlike acids or retinoids, it does not strip the skin barrier or increase photosensitivity. In fact, it counters the mild dryness that some users experience after a 10-minute session.
Most dermatologists and clinics recommend applying it AFTER the mask. LED works best on bare, clean skin. However, some reliable brands (like Omnilux) formulate specific clear serums to be used underneath. If you use a generic serum, apply it afterwards to avoid blocking the light or creating a sticky heat trap.
Absolutely. Hyaluronic acid supports hydration. Since many LED protocols involve 3-5 sessions a week, pairing it with daily HA helps maintain the 'Glow' and keeps the barrier healthy.
This is common in dry environments or with silicone masks. If you apply HA before the mask without a sealer, it can draw moisture OUT of the skin. If your mask session is long (>10 mins), try using it on bare skin and saving the HA for immediately after.
Not directly (it doesn't boost the light absorption), but it improves the visible result. Plumper, hydrated skin reflects light better and looks healthier, complementing the long-term collagen benefits of the LED.
Pairing a good hydration routine with a safe LED mask is the best way to get that "glass skin" glow.
Medical Disclaimer: GlowLab does not provide medical care. LED masks and skincare actives may interact unpredictably for sensitive users. Always consult a dermatologist if you use prescription actives (tretinoin, azelaic acid, antibiotics) or have a skin condition.