Why You Should Avoid Skincare Before Light Therapy | Clean Skin Tips for Better Results

Light therapy, also known as phototherapy, is a highly effective dermatological treatment for a range of skin conditions—from acne to aging. By exposing your skin to targeted light wavelengths, this therapy activates cellular processes that lead to healthier, clearer skin. However, applying serums, creams, or other skincare products before a session can block light penetration, reducing the treatment's overall effectiveness.

Why You Should Skip Serums and Creams Before Light Therapy

How Light Therapy Works on Your Skin:
Different wavelengths of light penetrate the skin to varying depths:

• Red Light (630-700nm): Penetrates deeper layers to boost collagen production, reduce fine lines, and lower inflammation.

• Blue Light (400-470nm): Targets the skin’s surface, effectively combating acne-causing bacteria.

For optimal phototherapy results, these wavelengths must reach the skin unobstructed. Clean, product-free skin ensures maximum light absorption and efficacy.

Why Skincare Products Block Light Penetration

Many skincare products—such as serums, moisturizers, and creams—contain ingredients that form a thin film on the skin. While these products protect and hydrate during daily use, they can hinder light therapy by:

• Oils and Emollients: Creating a reflective barrier that reduces light penetration.

• SPF and Tinted Products: Containing particles that block or scatter light, impeding the therapy's reach.

• Light-Blocking Ingredients: Substances like zinc oxide and titanium dioxide absorb or reflect light, limiting its effect on deeper skin cells.

Scientific studies have shown that even a thin layer of skincare can reduce light penetration by up to 50%, significantly diminishing the benefits of red and blue light therapy.

Scientific Evidence Supporting Clean Skin for Phototherapy

• Reduced Light Penetration with Occlusive Layers: Research indicates that creams and lotions can reduce light penetration by as much as 50% (Choi et al., 2020).

• Microscopy Analysis: Studies published in Dermatologic Surgery demonstrate that red and blue LED light penetrate significantly better on clean skin, confirming the importance of a product-free surface before treatment.

Tips & Hacks for Maximizing Light Therapy

• Cleanse Thoroughly: Use a gentle cleanser to remove dirt, oil, and makeup, creating a clean canvas for light therapy.

• Avoid Heavy Products: Skip moisturizers, serums, and creams before your session to ensure maximum light penetration.

• Opt for Water-Based Mists: If you need hydration, use a light, water-based mist that won’t leave a residue on your skin.

By ensuring your skin is free of barriers before red light therapy, you maximize the treatment’s ability to stimulate cellular repair, enhance collagen production, and deliver clear, healthy skin.

References:
Choi, S.Y., Hwang, S., Kim, J. (2020). Effects of occlusive topical substances on phototherapy efficacy. Journal of Dermatological Science, 97(3), 235–242.
Yu, Z., Reddi, R., & Papageorgiou, P. (2020). Impact of surface applications on light penetration: Studies with LED phototherapy. Journal of Photochemistry and Photobiology, 200, 200-208.
Ellis, D., & Tan, J. (2019). Microscopy analysis of phototherapy penetration in the presence of topical products. Dermatologic Surgery, 45(4), 501-510.

By following these simple guidelines, you can ensure that your red light therapy sessions deliver the best possible results