What substance should be avoided in skin products when using LED therapy?

The focus on avoiding certain substances in skin products during LED therapy primarily relates to how they can interact with light exposure and potentially affect the skin. Colorants, which are often synthetic dyes used to impart color to products, can absorb light in ways that could interfere with the intended effects of the LED therapy. Because LED therapy relies on specific wavelengths of light to penetrate the skin and promote healing or rejuvenation, any substances that might absorb or scatter that light could diminish the therapy's effectiveness.

Moreover, colorants may cause sensitivities or allergic reactions in some individuals, particularly when combined with the heat or stimulation that LED therapy provides. As a result, using products that do not contain colorants ensures that the LED lights can perform their functions without interference or adverse reactions.

In contrast, fragrances, mineral oils, and alcohols, while potentially irritating or not ideal for all skin types, don't directly impact the efficacy of light absorption and should still be chosen based on individual skin needs and concerns rather than solely on their interaction with LED therapy.