The product name "Cannabis Hair Mask" refers to Cannabis sativa seed oil, commonly called hemp seed oil. This oil is obtained by cold-pressing the seeds of industrial hemp varieties. Seeds do not produce cannabinoids; THC and CBD are synthesized in the flowers and leaves, not in the seeds. The source material for cosmetic-grade hemp seed oil is regulated to contain negligible (effectively zero) cannabinoid content.
In hair care, hemp seed oil is valued for its lipid composition: roughly 75–80% polyunsaturated fatty acids, notably linoleic acid (omega-6) and alpha-linolenic acid (omega-3), plus oleic acid. These fatty acids integrate into the hair's surface lipid layer, improving flexibility and reducing the rough, frizzy feel that comes from a depleted cuticle. There is no systemic absorption through the scalp or hair shaft that could produce psychoactive effects, and the oil will not trigger a drug test.
If you have a known allergy to hemp seed oil or cannabis-family plants, patch-test before full use. Otherwise, treat it like any other botanical oil in a rinse-off mask: apply to lengths, leave for the recommended time, rinse well.