I just purchased "Swisse" Calcium and D3 effervescent tabs, and could find no sugar or sweetner listed in the ingredients on the packaging or the website, but an hour after consuming, I can still taste that rotten sweet lingering taste. I emailed them, and got this reply.
We can confirm that there is no sugar in Swisse Ultiboost Calcium + Vitamin D3 however this formulation contains sucralose and sorbitol as sweeteners.
What a waste of money. I really try hard not to have any sugar at all, and get so annoyed, especially with health products when they don't list all the ingredients. I couldn't have picked a worse product to purchase. Feel like throwing up.