Douglas Harper's Etymology Dictionary
Wiktionary
a. Containing fewer allergens.
Wikipedia
Hypoallergenic, meaning "below normal" or "slightly" allergenic, was a term first used in a cosmetics campaign in 1953. It is used to describe items (especially cosmetics and textiles) that cause or are claimed to cause fewer allergic reactions. Hypoallergenic pets still produce allergens, but because of their coat type, absence of fur, or absence of a gene that produces a certain protein, they typically produce fewer allergens than others of the same species. People with severe allergies and asthma may still be affected by a hypoallergenic pet.
The term lacks a medical definition, but it is in common usage and found in most standard English dictionaries. In some countries, there are allergy interest groups that provide manufacturers with a certification procedure including tests that ensure a product is unlikely to cause an allergic reaction, but such products are usually described and labeled using other but similar terms. So far, public authorities in no country provide an official certification that an item must undergo before being described as hypoallergenic.
The cosmetic industry has been trying for years to block an industry standard for use of the term; in 1975; the USFDA tried to regulate the term 'hypoallergenic", but the proposal was challenged by cosmetic companies Clinique and Almay in the United States Court of Appeals for the District of Columbia, which ruled that the regulation was invalid. Thus, cosmetic companies are not required to meet any regulations or do any testing to validate their claims.
Usage examples of "hypoallergenic".
Suspended in a sea of milky white, the light of his life lay unmoving beneath a thin layer of eggshell sheets and pastel blankets, her hair haloed behind her head which was gently cradled by an oversized, hypoallergenic pillow.
Beneath the perfume she smelled faintly of hypoallergenic soap and unscented deodorants.
Her bedding had been ripped off her mattress, her comforter vomiting up pieces of hypoallergenic foam.
One squat fellow in his midtwenties sported a circlet of chromed hypoallergenic metal that crowned his skull like the rim of a metal cap.