1. Oil is a barrier and may not be able to penetrate the scalp
For anything to be able to improve hair growth, it needs to reach the target tissue which is the dermal papillae that lives at the base of the follicle. Although research has found a select few oils to be able to do so, most oils have not been clinically shown to have this property.
2. Sensitive scalps may suffer from added oil
When people massage oil on to the scalp, this induces erythema which is bringing blood to the surface. Erythema can stimulate and strengthen the follicle. However if the scalp is already sensitive adding oil may further irritate or aggregate the condition.
3. Daily application of oil can cause scalp issues
Applying oil daily to the scalp can induce and exacerbate scalp disorders for people who are susceptible such as:
This happens as a result of the oil mixing with our natural sebum which is an oil produced by your body that moisturises, coats and protects your skin. The added oil will not penetrate your skin, but instead feed the yeast that lives on your skin.
4. Essential oils can cause scalp burns
This can happen as pure essential oils contain compounds called furocoumarins which are photosensitisers meaning they intensely increase the skin's sensitivity to UV light.
Therefore, if you apply undiluted essential oil to your skin and are exposed to UVA rays (from the sun) your skin will burn at a dangerous rate.
If you are suffering from any scalp issues, please consult with a licensed Trichologist or your medical provider.