Borago Officinalis Seed Oil

Borago officinalis (borage) seed oil is primarily an emollient rich in linoleic acid and gamma-linolenic acid, typically used at a few percent up to higher levels in barrier-support products. Clinical experience and patch-test data generally show low irritancy for non-fragranced, well-refined plant oils, but a small subset of highly reactive or eczematous patients can experience irritation or rare allergy (and oxidized oils can be more reactive). Given sensitive-skin safety priorities, I rate it as very gentle but not inert. Safety Notes: In mainstream leave-on creams/lotions and serums, borage seed oil is often used as a supporting emollient or omega-6/GLA source at low sub-1% levels (commonly ~0.05–0.5%) alongside other oils to manage cost/odor/oxidation, with rinse-off cleansers typically at similar or lower levels. Mid-range leave-on facial oils and barrier-repair creams frequently use ~1–10% (sometimes higher) when positioned as a key lipid. The high end in consumer OTC products reaches 100% in single-ingredient borage oil sold as a topical facial/body oil, and ~20–50% in anhydrous oil blends/balms where it is the dominant oil.