The company, a subsidiary of Belgian firm Omega Pharma, has called in the Chelsea-based agency to primarily relaunch the Natra herbal medicine range.
Ozone, whose contract spans media and professional relations, will also potentially promote brands such as insect repellent Jungle Formula, head-lice treatment Lyclear and fatigue-busting Red Kooga ginseng capsules.
Ozone MD Paul Jarman said the agency had been briefed to 'invigorate' the brands, 'making them more attractive, interesting and relevant to both media and consumers'.
The Natra range - which includes Natrasleep and Natracalm - relaunches in the autumn, with PR focused on a new laxative, Natralax, which contains active ingredient frangula bark, said Jarman. Its packaging is awaiting MHRA approval.
The campaign will target homeopaths and medics, as well as consumers.
Chefaro brand managers are yet to decide which brands outside the Natra range will receive significant PR backing from Ozone.
Omega bought Chefaro in 2002 and TCP and Lycear from Pfizer 12 months ago. Brands including Natracalm, Natrasleep and Red Kooga were formerly owned by Peter Black Healthcare.
Ozone beat Munro & Forster Communications in a shootout for the contract.
Chefaro also had initial discussions with Bloomsbury Communications.
Chefaro UK brands were formerly promoted by Euro PR Group. The agency confirmed that it had ceased to work on the account.