'immune-boosting' is a modern compound formed from 'immune' and 'boost'. 'immune' originates from Latin, specifically the word 'immunis' where 'im-' meant 'not' and 'munis' meant 'obliged/duty' (original sense: exempt). 'boost' is from English dialect (origin uncertain), first attested in the 18th century meaning 'to push' or 'to increase'.

'immune' entered English via Old French/Late Latin from Latin 'immunis'; 'boost' developed in regional English use and became standard English; the compound 'immune-boosting' arose in late 20th century English as health and marketing language combining the adjective 'immune' with the gerund/participle 'boosting'.

Initially, 'immune' meant 'exempt (from public service or duty)' and 'boost' originally meant 'to push or strike'; over time 'immune' shifted toward 'resistant to disease' and 'boost' broadened to mean 'to increase', so 'immune-boosting' now means 'increasing immune function'.