How to use vitamin C powder
By Safa Berraies, Head of R&D and industrial biology engineer, updated on 26 October 2026
Vitamin C powder always raises the same questions: how much to take, when, for how long, are there any precautions, can children take it? Here are short, sourced answers to each one.
250 mg
of vitamin C per scoop
1,000 mg
maximum per day for an adult
2 doses
morning and evening, rather than one
1 month
a common benchmark for a course
For everything about the forms of vitamin C and how they differ, see our reference page: Vitamin C: everything you need to know.
Why choose vitamin C powder?
Because it is the form that contains nothing but vitamin C.
Our pure plant-based vitamin C powder, 100% L-ascorbic acid, contains nothing else:
Tablets, effervescents and liposomal forms, on the other hand, contain binders, bulking agents or lipids, sometimes up to 3 grams of additives for 1 gram of vitamin C.
Two practical advantages are added:
- An ultra-soluble powder that dissolves in the drink of your choice (water, juice, smoothie).
- The measuring scoop delivers 250 mg doses, making it easy to make up the intake you want (250, 500, 750, 1000 mg) and to spread it over the day (we will see below why this matters).
How to take vitamin C powder?
Measure
Take the desired dose with the measuring scoop included: each scoop delivers 250 mg of vitamin C.
Pour
Into a small amount of water, fruit juice or a smoothie. You can also sprinkle it over a fruit salad.
Stir and drink
Stir for a few seconds, then drink straight away.
How much vitamin C per day?
For an adult, up to 1000 mg per day, all sources combined.
This is the maximum recommended level in a food supplement set by the DGCCRF, the French consumer protection authority (Health recommendations on nutrients, version 2, January 2019).
To put this figure in context: the daily reference requirement is much lower. ANSES (the French food safety agency) sets the Population Reference Intake at 110 mg/day for adults. The 1000 mg is therefore not a target to reach, but a ceiling not to be exceeded.
To understand the difference between the 80 mg on the label, the 110 mg set by ANSES and the 1000 mg ceiling, see the dedicated section of our reference page.
Should you split your vitamin C intake?
Yes, and this is the most important point in this guide.
Taking 1000 mg in one go does not deliver 1000 mg to your body. Vitamin C is absorbed by an active transporter (SVCT1, in the small intestine) which becomes saturated beyond a certain quantity per dose.
The reference data (Levine et al., PNAS 1996) show that bioavailability is complete for a 200 mg dose, but that it declines from 500 mg taken at once: the excess is then eliminated in the urine.
Proportion actually absorbed according to the dose taken at once. Source: Levine M. et al., PNAS, 1996.
In practice: splitting is better than increasing. For example 250 mg in the morning and 250 mg in the evening, before, during or after a meal.
Taking vitamin C in two separate doses, one in the morning and one in the evening, is also the split recommended by Professor Balz Frei, former director of the Linus Pauling Institute (Oregon State University).
Sources: Levine M. et al., PNAS, 1996 · Prof. Balz Frei, LaNutrition.fr (in French)
How long should a course of vitamin C last?
The body needs vitamin C continuously: it cannot make it, and does not store it for long. Whatever is not used is eliminated.
A one-month course is a common benchmark, particularly during periods of temporary tiredness or increased demand on the immune system. Some people pay closer attention to it, smokers in particular, whose requirements are higher.
Supplementation never replaces a varied diet: it complements intakes that fruit and vegetables already partly provide.
Side effects: what precautions?
At usual doses, vitamin C powder is well tolerated.
- Feeling some discomfort? Reduce the amount per dose, dilute in a larger volume of water and spread your intake over the day.
- Prefer a less acidic vitamin C? Sodium ascorbate, with a near-neutral pH, is an alternative to L-ascorbic acid. 4 scoops provide around 900 mg of vitamin C and 100 mg of sodium. Find out more.
- Ongoing medical treatment: ask a healthcare professional for advice before starting any course.
Can children take vitamin C powder?
Yes, provided that age-appropriate levels are respected. The DGCCRF sets separate maximums:
| Age | Maximum recommended level per day |
|---|---|
| Children aged 10 or under | 200 mg |
| Children over 10 years | 500 mg |
| Infants (0-1 year) and young children (1-3 years) | Medical supervision required |
Source: DGCCRF, Health recommendations on nutrients, v2 (2019) (in French)
What about pregnant or breastfeeding women?
As a general rule, the DGCCRF recommends consulting a healthcare professional before taking any supplement during pregnancy and breastfeeding.
Discover our pure vitamin C powder PURE C →
Any questions?
Our team answers Monday to Friday, by email, chat or phone.
📞 +33 1 82 28 00 28 · ✉️ Hello@vitaminec.com
About the author
Safa Berraies is Head of Research & Development at Nutrizoé. She is an industrial biology engineer (INSAT, Tunis) and holds a research master's degree in medical biology and health technologies (Faculty of Pharmacy of Monastir).
