'non-allergenic' originates from the prefix 'non-' meaning 'not' and 'allergenic' derived from 'allergy', which comes from the Greek word 'allergia' meaning 'other work'.

'allergenic' changed from the Greek word 'allergia' and eventually became the modern English word 'allergenic'.

Initially, it meant 'not causing an allergic reaction', and this meaning has largely remained the same in modern usage.