How much Vitamin C do I need per day?
How much Vitamin C you need a day
The number most people want is a single figure. The useful answer is a figure plus the reason it has to be met again tomorrow.
The recommended daily allowance
In India, recommended daily allowances are set by the ICMR. Celin DZ is formulated against them: its 80 mg of Vitamin C is stated on pack as 100% of the RDA, and its 600 IU of Vitamin D3 likewise.
An RDA is not a target for optimal health or a maximum. It is an intake estimated to meet the requirements of most healthy people in a population group. Individual needs vary with age, pregnancy, smoking, illness and a good deal else, which is why the useful version of this question is one for your physician rather than a search engine.
Why it has to be daily
Vitamin C is water-soluble. The body maintains no meaningful store of it, and excess is excreted rather than banked. Plasma levels respond to intake within hours and fall again just as readily.
The practical consequence is that consistency beats quantity. A moderate amount every day does more than a large amount twice a week, because the days in between are simply days without.
A daily allowance is not the same as a 500 mg tablet
This is the distinction most often collapsed in the vitamin aisle. A supplement formulated at 80 mg is designed to top up ordinary dietary intake. A 500 mg pharmacopoeial tablet is a different category of product, taken as a physician directs, and it exists for situations where a physician judges a substantially higher intake to be warranted.
It matters in both directions. Someone assuming a daily supplement is "the same but weaker" is mistaken, and so is someone assuming a 500 mg tablet is simply a generous supplement.
Celin 500 contains 500 mg. Celin DZ contains 80 mg. They are not stronger and weaker versions of one another.
Can you take too much?
Vitamin C has a low toxicity, and excess is largely excreted. That is not a licence to take unlimited amounts: high intakes are associated with gastrointestinal upset, and there are specific situations — kidney stones, iron-overload conditions, certain medications — where the answer changes entirely.
Supplement packs carry a "do not exceed the recommended daily usage" instruction for a reason. For anything beyond label directions, ask a physician.
Nutrient roles throughout this section are per the NIH Office of Dietary Supplements Vitamin C fact sheet for health professionals. Nothing here is medical advice.