Quercus Acuta Bark Extract — INCI reference

What it is

Quercus Acuta Bark Extract is derived from the bark of Quercus acuta, the Japanese evergreen oak native to Japan, South Korea, Taiwan, and parts of China. The bark is naturally rich in tannins (including gallotannic acid and ellagic acid), flavonoids, and phenolic acids. These polyphenolic compounds contribute to the extract's skin-conditioning properties, helping skin feel softer and smoother. Tannins impart a mild astringent effect that can help temporarily minimize the appearance of pores and reduce excess sebum. The extract also demonstrates antioxidant activity, scavenging free radicals and potentially helping to protect skin from oxidative stress. Studies on related Quercus acuta fruit extract show inhibition of UVB-induced collagen degradation and reduction of intracellular reactive oxygen species in keratinocytes, suggesting that the bark extract's polyphenolic profile may support similar protective mechanisms.

Safety & warnings

Generally considered safe for topical use. Contains tannins that may rarely cause skin irritation or allergic reactions in sensitive individuals; patch testing is advisable. Low comedogenicity (rated approximately 1 out of 5). No significant safety restrictions noted in available CosIng or EWG databases for this species specifically, though general oak extract sensitivities apply. Safety data for use during pregnancy or breastfeeding is limited.

Origin & sourcing

Obtained from the bark of Quercus acuta (Japanese evergreen oak), an evergreen tree reaching up to 14 meters, native to Japan, South Korea, Taiwan, and southern China. The bark is harvested, dried, and ground, then subjected to water- or alcohol-based solvent extraction. The resulting liquid is filtered and concentrated before incorporation into cosmetic formulations.

History

Quercus acuta has long been valued in East Asian cultures; its dense hardwood has been used for centuries in Japan for martial arts weapons (bokken) and construction. Traditional use of oak bark as an astringent and skin treatment in East Asian folk medicine preceded its introduction to modern cosmetic formulations, where it is recognized primarily as a skin conditioner.

Questions everyone asks

What makes Quercus Acuta Bark Extract different from other oak bark extracts?

Quercus acuta is a Japanese evergreen oak species native to East Asia, distinguished from European oaks such as Quercus robur or Quercus petraea. While all oak bark extracts share a tannin-rich profile, Quercus acuta is particularly associated with Japanese and Korean cosmetic traditions and may car

What skin concerns does Quercus Acuta Bark Extract address?

The extract is primarily used as a skin conditioner to improve skin softness and smoothness. Its tannin content provides mild astringency that can help minimize the appearance of pores and manage excess oil.

Is Quercus Acuta Bark Extract safe for sensitive skin?

It is generally considered safe, but because it contains tannins and polyphenols, individuals with sensitive skin or known oak allergies may experience irritation. Patch testing before use in leave-on formulations is recommended.

How is the bark extract produced?

Bark is harvested from Quercus acuta trees, dried, and milled into a powder. Beneficial compounds are then extracted using water or alcohol-based solvents, after which the extract is filtered and concentrated for use in cosmetic formulations.