Delicious orange flavour effervescent tablets Contains Vitamin C and Zinc Immune support These Holland & Barrett Effervescent tablets contain Vitamin C and Zinc, both of which contribute to the normal function of the immune system as well as the protection of cells from oxidative stress. Effervescent tablets allow for fast absorption of nutrients into the bloodstream. Delicious orange flavour effervescent tablets Contains Vitamin C and Zinc Immune support These Holland & Barrett Effervescent tablets contain Vitamin C and Zinc, both of which contribute to the normal function of the immune system as well as the protection of cells from oxidative stress. Effervescent tablets allow for fast absorption of nutrients into the bloodstream.