VITAMINS
Vitamin C (ascorbic acid)
Vitamin C (ascorbic acid) is an antioxidant that supports immune function and collagen formation.
Also known as: ascorbic acid, ascorbate, vit C
At a glance
- Form
- Ascorbic acid
- Category
- Vitamins
- In an apiece formula
- 500 mg a day (you can change it)
- Recommended intake
- 75 mg (women), 90 mg (men)
- Upper limit
- 2,000 mg a day
- Studied for
- Immune support, Skin health*
- Reference
- NIH ODS: Vitamin C fact sheet
Who should be careful
Our safety rules leave vitamin C out of a formula, or keep the amount lower, with:
Kept to a lower amount with
- Chemotherapy or targeted cancer pills
- Radiation therapy
- Cancer immunotherapy
- Phosphate binder
- Dialysis
- Regular blood transfusions
- Chronic kidney disease
- Advanced kidney disease
- Calcium oxalate kidney stones more than once, or primary hyperoxaluria
- Kidney stones
- G6PD deficiency
Health conditions
- Hemochromatosis
- Thalassemia
Always check with your doctor or pharmacist before adding a supplement if you take medication, are pregnant or nursing, or have a health condition. Stay under the upper limit from all sources combined, including multivitamins.
Symptoms it’s studied for
- Tired or low energy
- Afternoon crash
- Brain fog or poor focus
- Poor sleep
- Catching every cold
- Hair shedding
- Skin issues (acne, dry, eczema)
- Muscle cramps or twitches
From the Journal
- Are personalized vitamins worth it? Personalized blend vs a multivitamin
What a standard multivitamin does well, where it falls short, what research says about personalized nutrition, and how to tell whether a personalized blend makes sense for you.
- Iron and ferritin: who actually needs an iron supplement?
What ferritin and transferrin saturation show, who tends to run low on iron, why to test before taking it, hemochromatosis caution, and how to take iron so it absorbs and sits well.
Questions
How much vitamin C a day?
apiece formulas usually include 500 mg a day. The recommended intake for adults is 75 mg (women), 90 mg (men). Upper limit: 2,000 mg a day.
What is vitamin C used for?
Vitamin C (ascorbic acid) is an antioxidant that supports immune function and collagen formation. In apiece it is part of formulas for Immune support, Skin health.*
Who should be careful with vitamin C?
apiece’s safety rules leave it out or limit it with: Chemotherapy or targeted cancer pills; Radiation therapy; Cancer immunotherapy; Phosphate binder; Dialysis; Regular blood transfusions; Chronic kidney disease; Advanced kidney disease; Calcium oxalate kidney stones more than once, or primary hyperoxaluria; Kidney stones and others. Check with your doctor or pharmacist if any apply to you.
Can I get vitamin C in a personalized supplement?
Yes. apiece builds one daily blend around your goals and, if you have them, your lab results. Vitamin C can be part of it at the amount listed, with every ingredient shown and never more than 10 capsules a day.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.