What to Apply on Your Face Before Red Light Therapy

Autumn Goodman 2017-04-19

Before red light therapy, your face should be clean and either bare or lightly hydrated. A thin water-based serum, such as hyaluronic acid, or plain aloe gel is fine. Leave retinoids, exfoliating acids, strong vitamin C, mineral sunscreen, makeup and heavy creams until after your session, because they can block light or irritate your skin.

This guide is for anyone using an at-home LED mask or panel, or booking in-clinic sessions, who wants to get the most out of each one without irritating their skin.

Key takeaways

  • Cleanse first. Makeup, sunscreen and leftover products sit between the light and your skin.
  • If you want something on your skin, choose a thin, water-based, fragrance-free layer.
  • Save retinoids, acids, vitamin C and rich creams for after the session.
  • Mineral sunscreens and heavy, shimmery or tinted products can reflect or scatter light.
  • Check with a doctor first if you take medicines that make you sensitive to light or have a light-sensitive condition.

Why does skin prep matter for red light therapy?

Red and near-infrared light has to pass through the surface of your skin to reach the cells underneath. Anything that reflects, scatters or absorbs light on the way in reduces how much gets through. Think of trying to read through frosted glass. A thick cream, a layer of foundation or a mineral sunscreen does the same thing to light.

It's worth keeping expectations realistic. The American Academy of Dermatology says red light therapy may help with fine lines, rough texture, redness and some types of acne and hair loss, but results are usually subtle to noticeable and more research is needed. The Cleveland Clinic adds that many studies have been small, and home devices are often less powerful than clinic equipment. Good prep won't turn a modest treatment into a dramatic one, but poor prep can make a modest one less effective.

Step 1: Start with a clean face, not a stripped one

Wash with a gentle, fragrance-free cleanser to remove makeup, sunscreen, oil and leftover serums. If you wore heavy makeup or water-resistant sunscreen, a two-step cleanse (an oil or balm cleanser, then a gentle wash) works well.

Avoid harsh foaming cleansers or scrubs right before a session. You want clean skin, not tight, irritated skin. Some products, especially thick or oily retinoid formulas, can be harder to remove than you'd expect; our article on product residue that won't wash off explains why and what to do about it.

Pat your skin dry. Some device instructions say to use the device on completely dry skin, so follow yours if it does.

What can you put on your skin before a session?

You don't have to use anything. Bare, clean skin is the simplest option. If your skin feels tight or dry, these are generally fine:

  • Hyaluronic acid serum. A thin, water-based layer that hydrates without forming a heavy film.
  • Plain aloe vera gel. Choose one without fragrance, colour or added alcohol.
  • A hydrating toner or essence. Water-based, fragrance-free and without exfoliating acids.
  • Niacinamide serum in a light, water-based formula, if your skin is used to it. Our guide to vitamin B3 and niacinamide explains what it does.

Let whatever you apply sink in for a few minutes so your skin isn't wet or tacky when you start.

What should you avoid before red light therapy?

Use this table as a quick reference.

ProductBefore your session?Why
Hyaluronic acid, aloe gel, hydrating tonerYes, in a thin layerLight and water-based
Retinoids (retinol, retinal, tretinoin)No, use afterwards or on another eveningCan make skin more reactive and irritated
Exfoliating acids (glycolic, lactic, salicylic)NoCan leave skin sensitive and increase irritation
Strong vitamin C serumsBest saved for laterCan sting on sensitised skin; usually better under morning sunscreen
Mineral sunscreen (zinc oxide, titanium dioxide)NoDesigned to reflect and scatter light
Makeup, tinted or shimmer productsNoPigments and particles block or scatter light
Thick creams, balms, facial oilsNo, apply afterwardsForm a film that can reduce light reaching the skin
Fragranced products and essential oilsNoSome can irritate or make skin more light-sensitive

A note on sunscreen

Skipping sunscreen before a red light session doesn't mean skipping it for the day. If your session is in the morning, apply sunscreen afterwards, before you go outside. Red light devices don't give off the UV that causes sunburn, but daylight does. Our guide on how often to reapply sunscreen covers the rest of the day.

How should you layer products after the session?

After treatment is the right time for the products you skipped:

  1. Hydrating serum, if you didn't use one before.
  2. Treatment products, such as a retinoid in the evening. If you're new to retinoids or your skin feels warm or sensitive, wait until your skin feels normal, or use it on non-session evenings.
  3. Moisturiser, as rich as your skin needs.
  4. Sunscreen if it's daytime.

If you're also treating dark spots, red light can sit alongside a pigment routine, but keep the strong actives at a different time. Our guide to preventing and fading age spots explains which ingredients do the heavy lifting.

Who should be more careful?

A common mistake is assuming that because red light isn't UV, it's suitable for everyone. The AAD advises extra caution if you:

  • take medicines that increase sensitivity to light (some antibiotics, acne treatments and other drugs)
  • have a light-sensitive condition such as lupus
  • have a darker skin tone, as visible light can trigger longer-lasting dark spots in some people

Always follow your device's instructions on session length and frequency, and wear the eye protection it recommends. Sunglasses aren't a substitute for proper goggles. If your skin barrier is already damaged, keep your routine very simple for a while; the approach in our guide to skincare for eczema-prone and sensitive skin works well alongside red light.

Quick pre-session checklist

  • Face cleansed and patted dry
  • No makeup, sunscreen, retinoid, acid or heavy cream on the skin
  • Optional thin hydrating layer, fully absorbed
  • Eye protection ready if your device recommends it
  • Session length set according to the device instructions

FAQ

Should my skin be wet or dry for red light therapy?

Most devices are designed for clean, dry skin, and some instructions say so directly. A thin hydrating serum is usually fine once it has absorbed and your skin no longer feels wet or sticky. Water droplets and thick layers can scatter light, so wait a few minutes after applying anything. Always check your own device's instructions first.

Can I use red light therapy after retinol?

It's better to use red light first and the retinoid afterwards, or on a different evening. Retinoids can make skin more reactive, and adding warmth and light on top may increase irritation in some people. If your skin is used to your retinoid and feels comfortable, applying it after your session is a common approach. Stop and simplify if you notice stinging or redness.

Do I need special gel or oil for red light therapy?

No. Facial red light therapy doesn't need a gel or oil to work, unlike some other beauty devices. Bare, clean skin is fine. Some people prefer a light hydrating serum for comfort, but oils and thick creams are better saved for afterwards. If a device comes with its own gel, follow the manufacturer's instructions for that product.

What to do next

  • Read your device's instructions for session length, frequency and eye protection.
  • Move your retinoid, acids and rich moisturiser to after your session or to non-session evenings.
  • Check the leaflets of any medicines you take for warnings about light sensitivity.
  • See a dermatologist before starting if you have a darker skin tone, a light-sensitive condition or a skin problem that isn't improving.

This article is for general information and is not medical advice. See a doctor or dermatologist before using red light therapy if you take light-sensitising medicines, have a skin condition, or notice burning, blistering or lasting dark spots after a session.

Sources

Last reviewed: October 2026.

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