These tablets are specially formulated to release the vitamin C gradually over 6-8 hours after swallowing, which means that the absorption of vitamin C into the bloodstream also occurs gradually. This is believed to create a more stable level of vitamin C in the blood for a longer period. Lamberts Time Release Vitamin C 1000mg tablets also contain a relevant level of bioflavonoids, the natural compounds that are often associated to vitamin C in fruits and vegetables. Vitamin C contributes to normal collagen formation for the regular function of cartilage, the tough tissue that lines the surfaces of joints. Vitamin C also contributes to the normal function of the immune system and to the protection of cells from oxidative stress caused by \'free radicals\' Suitable for vegetarians and vegans.