“Calcium Ascorbate?”Here!a buffered form of vitamin C
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As a supplement
Talk to your doctor or pharmacist.
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A mineral salt formed by combining ascorbic acid (vitamin C) with calcium, used to make vitamin C less acidic on the stomach.
Why it’s used
Taken as a source of vitamin C, sometimes chosen by people who find plain ascorbic acid harsh on digestion.
What the evidence is for
preventing vitamin C deficiency and supporting normal collagen, immune, and antioxidant function.
What the evidence says
NIH ODS confirms vitamin C's established role in collagen formation, immune function, and iron absorption, and in preventing scurvy at very low intakes. Evidence for benefits beyond correcting low intake, such as reducing common colds in the general population, is weaker and inconsistent. The calcium-buffered form is not shown to work differently from ascorbic acid itself once absorbed.
Dose studied
65–2000 mg — adult RDA up to the tolerable upper intake level, per NIH ODS.
Context
NIH ODS lists an adult RDA of about 65-90 mg/day and a tolerable upper intake level of 2,000 mg/day; studies of cold-related outcomes have generally used doses well above the RDA.
Rumors
Preventing scurvy — the fatigue, swollen and bleeding gums and poor wound healing of vitamin C deficiency.
Supports — establishedhealth and safety evidence
Measured as a biomarker.
- Vitamin C - Health Professional Fact Sheet (Regulatory) · Funding not checked
How much is a reference amount
- 75 mg a dayfor adults 19 and over, women · Recommended Dietary Allowance
Upper limit 2,000 mg a day, from food and supplements together.
- 90 mg a dayfor adults 19 and over, men · Recommended Dietary Allowance
Upper limit 2,000 mg a day, from food and supplements together.
People who smoke need 35 mg/day more. That is a third population axis the table does not carry, so it is stated here rather than silently dropped.
Every applicable line is shown because we don’t know which one is yours, and a reference intake is a target for a population, not a threshold for harm.