Is this any help? I found it on the Waitrose website.
**Calcium Carbonate Prep (Maltodextrin), Bulking Agent (Microcrystalline Cellulose), Vitamin C Prep (Ascorbic Acid, HPMC), Magnesium Bisglycinate Prep (L-Glycine, Magnesium Oxide, Citric Acid), Magnesium Oxide, Caffeine, Nicotinamide...