Essential Oil of Hemp: What Are the Benefits for the Skin?

The skin is exposed daily to various aggressions: repeated and prolonged exposure to the sun, polluted air, insufficient water consumption, unbalanced diet, daily use of cleansing cosmetics, etc. These factors weaken the hydrolipidic skin barrier and therefore negatively influence the skin's moisture level. In the case of many skin conditions such as atopic dermatitis, psoriasis, eczema, as well as in the process of wound healing, it is important to maintain an adequate level of skin hydration, especially since they are associated with a damaged skin barrier function.

Studies have shown that hemp face oil has a positive effect on skin hydration, especially on the reconstruction of the hydrolipidic balance. Rich in omega-3, 6 and 9, these fatty acids can act as an occlusive film on the skin's surface, strengthening the skin's hydrolipidic barrier and leading to a decrease in transepidermal water loss. Applied pure or mixed with other vegetable oils, it quickly penetrates the skin and does not leave a greasy film. It makes the skin softer and more elastic, while fighting against dehydration.

Acne vulgaris is a skin disease associated with the proliferation of Cutibacterium acnes (formerly known as Propionibacterium acnes), a symbiotic microbe of the skin, which activates an immune response. Indeed, C. acnes stimulates the secretion of cytokines and chemokines (TNF-α, interleukins, etc.), causing chronic inflammation. Excess sebum production also causes acne by inducing an inflammatory reaction under the proliferating skin microflora and by modifying its composition. This breakdown produces substances that fuel the inflammation and lead to the formation of acne pimples (pustules and papules).

In addition to inactivating the growth of Cutibacterium acnes, a cell-based study demonstrated that hemp seed hexane extract inhibits the secretion of pro-inflammatory molecules, such as TNF-α, IL-1β and IL-8, through the expression of inflammatory enzymes in keratinocytes infected with C. acnes. It also regulates the NF-kB (Nuclear factor kappa B) signaling process, which induces the transcription of genes involved in inflammatory responses. Moreover, hemp extract also inhibits the expression level of 5-lipoxygenase, thus regulating the production of intracellular lipids in sebocytes (epithelial cells involved in sebum production) and therefore inflammation. Indeed, the latter promotes lipid synthesis in the sebaceous glands by releasing leukotriene B4 (LTB4), a pro-inflammatory lipid.

In addition, inflammation induces damage to the extracellular matrix by inhibiting collagen production in dermal fibroblasts and activating the activity of specific enzymes (elastase, collagenase, gelatinase, etc.), which leads to the suppression of skin regeneration in the case of inflamed acne lesions. A study has shown that hemp can increase the biosynthesis of collagen, which shows its potential to improve the healing and regeneration processes of the skin, in addition to inhibiting the activity of metalloproteinase. Thus, essential oil of hemp can decrease extracellular matrix damage caused by C. acnes infection. However, studies conducted with in vivo models are needed to reinforce these findings on hemp as an anti-acne agent.

In addition to their antioxidant activity, essential oil of hemp contains active substances that have anti-inflammatory actions. It has been shown that hemp oil, especially omega-3, modulates inflammatory responses by inhibiting the release of pro-inflammatory mediators. This effect helps to relieve skin irritation and redness, making hemp facial oil a real ally for sensitive and problematic skin.