In beauty therapy, infra-red radiation is primarily absorbed in:

Infra-red radiation is primarily absorbed in the dermis and muscles due to their ability to retain heat and aid in deeper tissue penetration. The dermis is the layer of skin located beneath the epidermis and contains connective tissues, blood vessels, and nerve endings. This layer has a rich blood supply, which enhances its capacity to absorb infra-red radiation.

When heat is introduced via infra-red radiation, it effectively penetrates to this deeper layer, promoting increased blood flow and facilitating various therapeutic benefits such as pain relief and muscle relaxation. The muscles beneath the skin layer also respond effectively to infra-red radiation by generating warmth, which can help improve flexibility and lower muscle tension.

While the outer skin layers, such as the epidermis, do absorb some radiation, they primarily serve a protective role and do not extensively benefit from the heating effects associated with deeper infra-red exposure. Hair follicles are generally not significant sites for infra-red absorption because they are structures located within the epidermis and do not have the same level of vascularity or receptors for heat as the dermis and muscle layers. Understanding this mechanism is essential for effectively applying infra-red treatments in beauty therapy.