Vitamins​ are a kind of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions.

Relevant studies suggest that vitamin C effervescent tablets​ have a certain preventive effect on colds, especially the effect of adding zinc may be better.

If you are taking iron supplements that need to be converted into the correct form for absorption, taking vitamin C supplements will increase absorption. A glass of orange juice or a similar drink with a meal is not enough. However, active iron is absorbed in the correct form and protected in its protein matrix to the lower gastrointestinal tract, where it is absorbed, so vitamin C supplementation is not required when you take active iron.