Tests

The effects of sebum are supported by numerous scientific studies, which you can find here :

Tallow, Rendered Animal Fat, and Its Biocompatibility With Skin": A review of studies on the therapeutic benefits of applying sebum to the skin. The authors emphasize the need for further research in this area.

https://pubmed.ncbi.nlm.nih.gov/38910727/

 "NCM 1921, a Mixture of Several Ingredients, Including Fatty Acids..." : A study evaluating the effect of a mixture containing, among others, beef tallow oil on atopic dermatitis .

https://pmc.ncbi.nlm.nih.gov/articles/PMC7019988/

"Assessment of a Stable Cosmetic Preparation Based on Enzymatically Interesterified Fat Blend" : Study analyzing the moisturizing properties of an emulsion based on a fat blend .

https://www.ptfarm.pl/pub/File/Acta_Poloniae/2017/2/465.pdf

file:///C:/Users/User/Downloads/cureus-0016-00000060981.pdf

https://www.medicalnewstoday.com/articles/beef-tallow-for-skin#beef-tallow-for-skin