The move comes ahead of an undisclosed product launch, and as Efamol increases its investment in PR.
The West Sussex-based agency will handle an ‘extensive educational programme to maximise scientific research findings’.
The campaign includes brand-building activities across the product range.
Pegasus won the brief following a head-to-head pitch against the two-year incumbent agency.
Efamol sales and marketing manager Chris Blincoe said: ‘We want to get closer to health writers.’
Pegasus’s fees, believed to be at least £100,000, will be higher than Dig For Fire’s.