The new formulation, efferflu C Immune Booster Plus, still contains vital ingredients – vitamin C, zinc & echinacea – but now also has the added power of vitamin D.

This line extension was introduced in response to growing demand from consumers for a trusted, affordable immune boosting supplement that also contains vitamin D. Vitamin D is a multifaceted ingredient that is critical for healthy bones and teeth, muscle health, energy, and of course boosting immunity.