Which is the king of vitamin C?

Four different fruits are called the king of vitamin C, and the sources naming them are not wrong.

Camu camu, acerola, the Kakadu plum and sea buckthorn each hold the title somewhere in print. The gap between their published figures is not small either. Values for a single species have been measured across a roughly 300-fold range.

That inconsistency is the real answer, and it points somewhere more useful than a leaderboard.

Table of Contents

1. The Short Answer: Four Fruits Hold the Title
2. Dry Weight and Fresh Weight Are Different Numbers
3. The Same Species Gives Different Answers
4. What the Reference Database Actually Lists
5. The Trade-Off That Rarely Gets Mentioned
6. Why the Winner Matters Less Than the Ceiling
7. A Label That Does Not Vary: Bio Absorb Liposomal Vitamin C
8. Frequently Asked Questions
9. Conclusion
10. Research References

1. The Short Answer: Four Fruits Hold the Title

The crown moves depending on who is writing. Amazonian camu camu pulp has been measured at 2,400 to 3,000 mg per 100 g. Acerola is reported across a range of 1,500 to 4,500 mg per 100 g, roughly 50 to 100 times an orange or a lemon. Sea buckthorn is named elsewhere. Kakadu plum tends to win outright.

The catch is that these four figures are not directly comparable. One is fresh pulp, another is a literature range spanning a threefold spread, and Kakadu plum's headline numbers are usually measured on dried powder. A survey of 45 separately collected Kakadu plum samples found a mean of 15,190 mg per 100 g dry weight, which sounds five times richer than acerola until you account for the water that was removed first.

So the honest answer to which fruit is king is that it depends on the measurement basis, the growing region, the ripeness at picking and the individual plant. Four sources can each be accurate and still disagree.

2. Dry Weight and Fresh Weight Are Different Numbers

Most of the confusion online comes down to water. Fresh fruit is largely water, and one Kakadu plum dataset recorded a moisture content of 54.2 g per 100 g. Remove that water and the vitamin C concentrates into a smaller mass, so the same fruit can report two very different figures.

This is why a Kakadu plum figure above 15,000 mg per 100 g and a figure near 2,900 mg per 100 g can both come from real laboratory work. One is dry weight and one is fresh weight. Articles that rank fruits rarely say which they are quoting, and mixing the two inflates a fruit by a factor of two or more.

• Fresh weight describes fruit as you would eat it
• Dry weight describes freeze-dried powder, which is how most of this fruit is actually sold
• A single 100 g serving of dried powder is a much larger quantity of fruit than 100 g of fresh

None of the four contenders is commonly eaten fresh outside its growing region, which is part of why the dry-weight figure gets quoted. If you want a comparison built on foods you can actually buy, our guide to the foods that deliver the most vitamin C is the more practical starting point.

3. The Same Species Gives Different Answers

Even holding the measurement basis constant, the numbers move. Researchers sampling fruit from six individual Kakadu plum trees in one district of the Northern Territory found ascorbic acid averaging 11,133 mg per 100 g dry weight, with individual trees ranging from 85 to 25,667 mg per 100 g. The paper's own title calls the ascorbic acid figure uncertain.

The other contenders behave the same way:

• Ripeness. Acerola's total ascorbic acid fell about 60% between day 15 and day 21 after flowering, so greener fruit is richer than ripe fruit.
• Geography. Camu camu grown in Paraná State measured roughly 1,400 mg per 100 g against 2,400 to 3,000 mg for Amazonian fruit, which the authors put down to soil, humidity and climate.
• Storage. The same camu camu pulp held at minus 18 °C lost 23% of its vitamin C within 28 days, and 26% by day 335.
• Genetics. Across 45 Kakadu plum samples, variation was attributed to genetics, geography, climate and soil.

Put together, a single species can span a 300-fold range before anyone has cooked it, shipped it or put it in a capsule. Crowning one fruit assumes a precision the measurements do not support.

4. What the Reference Database Actually Lists

Rankings of vitamin C content routinely cite USDA FoodData Central, the public reference database that also supplies the figures in the NIH vitamin C fact sheet. Acerola appears there at about 1,677 mg per 100 g. Camu camu, Kakadu plum and sea buckthorn do not appear in the standard reference at all.

That matters for anyone checking a claim. The official ranked list of foods by vitamin C content is a short, verifiable document, and three of the four contenders are absent from it. Their figures come from individual research papers rather than a standardised national survey, which is exactly why they vary so much.

For foods most people can buy, the NIH table is more grounded: half a cup of raw red sweet pepper supplies 95 mg, a medium orange 70 mg, a medium kiwifruit 64 mg and half a cup of cooked broccoli 51 mg. Five varied servings of fruit and vegetables a day can provide more than 200 mg. Cooking cuts into that, with boiling reducing vitamin C by between 9.83% and 70.88% depending on the vegetable, while steaming or microwaving loses less.

5. The Trade-Off That Rarely Gets Mentioned

The fruit most often crowned carries a complication the rankings leave out. Chemical analysis placed Kakadu plum fruit in the high-oxalate category, with an oxalate-to-calcium ratio above 2, alongside star fruit, rhubarb and spinach. Foods above that ratio can bind calcium from other foods eaten at the same meal.

There is a second link. Oxalate is an end-product of ascorbic acid metabolism, so a fruit that is unusually high in vitamin C has the potential to raise urinary oxalate twice over. The researchers calculated how little freeze-dried powder it takes to pass 1,000 mg and 1,500 mg of ascorbic acid a day, and recommended that intake from fruit-derived products be monitored.

For most people this is a footnote rather than a warning. NIH notes that the strongest evidence linking vitamin C to kidney stones is in people with pre-existing hyperoxaluria, and sets the tolerable upper intake level at 2,000 mg a day for adults. Anyone with a kidney condition, haemochromatosis or a regular medication should talk to their doctor before taking concentrated vitamin C in any form, and our article on vitamin C side effects and the upper limit covers the detail.

6. Why the Winner Matters Less Than the Ceiling

Here is where the question changes shape. What reaches your bloodstream is not set by concentration in the fruit. It is set by how much your gut can move. NIH reports that 70% to 90% of vitamin C is absorbed at intakes of 30 to 180 mg a day, falling below 50% above 1 gram, with the surplus leaving in urine.

The landmark pharmacokinetic study behind the current RDA found the same pattern. Bioavailability was complete for a single 200 mg dose, then declined above 500 mg, reaching roughly 33% at 1,250 mg, and white blood cells reached saturation at 100 mg a day. Even 3 grams taken every four hours produces peak plasma of only around 220 µmol/L. Past a point, a richer source stops translating into a richer bloodstream, which is the argument our complete guide to liposomal vitamin C works through in full.

Delivery format is the variable that moves this ceiling rather than the fruit. A 2025 scoping review of 10 trials found that nine showed higher uptake for liposomal vitamin C, with exposure 1.3 to 7.2 times higher than non-liposomal forms, because liposomes are taken up by routes that do not depend on the saturable transporters. The same review is careful about what this does not show: how much is retained rather than excreted has not been measured in detail, and whether it produces a clinically meaningful difference in outcomes remains unestablished. The absorption advantage is supported. The outcome advantage is not yet. Why the ceiling exists at all is the subject of our article on why most of your vitamin C dose is wasted, and how the different formats compare is covered in vitamin C forms compared.

7. A Label That Does Not Vary: Bio Absorb Liposomal Vitamin C

Everything above describes a supply chain where the number moves. A tree in one clearing differs from a tree in the next. A green fruit differs from a ripe one. A frozen pulp differs from itself a month later. That variability is interesting in a research paper and awkward in a daily routine.

A supplement solves a narrower problem than a superfruit, and solves it more predictably. Bio Absorb Nutraceuticals makes its vitamin C in Canada in a GMP-certified facility and third-party tests every batch, so what is on the label has been verified independently rather than estimated from a harvest.

It comes in two formats. The Liposomal Vitamin C Liquid 1000mg (Corn-Free) mixes into water or juice. The Liposomal Vitamin C Capsules 1000mg (Corn-Free) need no refrigeration and travel well. Both use liposomal delivery, both are verified corn-free, and both are non-GMO, gluten-free, nut-free, dairy-free and vegan.

The corn-free part is worth a sentence. Most ascorbic acid on the market is fermented from corn, which matters to readers avoiding corn derivatives, and the source of the ascorbic acid is something a fruit ranking never addresses. Bio Absorb also backs both products with a money-back guarantee. For current pricing and serving details, see the full product specification.

Frequently Asked Questions

So which fruit actually has the most vitamin C?

On dry-weight measurement, Kakadu plum usually records the highest figures, with one survey of 45 samples averaging 15,190 mg per 100 g. On the US reference database, acerola leads among listed fruits. Both statements are accurate, which is the point.

Is an orange a poor source then?

No. A medium orange supplies about 70 mg, close to the full adult RDA of 75 mg for women and 90 mg for men. A fruit you eat weekly contributes far more over a year than one you have never seen in a shop.

Does camu camu or acerola powder count as a good source?

Both are concentrated and widely sold as powder. Their assay varies with harvest and storage, though, and camu camu pulp lost 26% of its vitamin C across 335 days of frozen storage, so batch testing matters more with these than with a standardised supplement.

Does cooking destroy vitamin C?

It reduces it. Boiling cut vitamin C by 9.83% to 70.88% across the vegetables tested in one study, with leafy greens worst affected. NIH advises that steaming or microwaving loses less, and many of the richest sources are eaten raw anyway.

Is a supplement better than eating the fruit?

For meeting the RDA, food works well, and five varied servings of fruit and vegetables can supply more than 200 mg a day. A supplement offers a consistent, tested quantity, which fruit cannot promise given the ranges in this article. Diet and supplementation answer slightly different questions.

How much vitamin C do I actually need?

The adult RDA is 90 mg for men and 75 mg for women, with an extra 35 mg a day for people who smoke, and a tolerable upper intake level of 2,000 mg. Our guide to vitamin C dosage breaks down where in that range different goals sit.

Conclusion

The king of vitamin C is a contest between four fruits whose figures move by season, soil, ripeness, drying method and individual plant, with one species spanning a 300-fold range in a single study. What reaches your bloodstream is governed by absorption, which drops below 50% above 1 gram a day regardless of which fruit the vitamin C came from. If a consistent, independently tested source is what you are after, see current pricing and serving details for Bio Absorb's liposomal range.

Research References

1. Do Liposomal Vitamin C Formulations Have Improved Bioavailability? A Scoping Review Identifying Future Research Directions. Basic & Clinical Pharmacology & Toxicology, Vol. 137, Issue 1, e70067 (2025). Reviewed 10 trials and found 9 showed higher uptake for liposomal vitamin C, with exposure 1.3 to 7.2 times higher, while noting that retention and clinical outcomes remain unstudied.
2. Vitamin C pharmacokinetics in healthy volunteers: evidence for a recommended dietary allowance. Proceedings of the National Academy of Sciences USA, Vol. 93 (1996). Established that bioavailability is complete at a single 200 mg dose and declines above 500 mg, reaching roughly 33% at 1,250 mg, with white blood cells saturating at 100 mg a day.
3. Organic acids in Kakadu plum (Terminalia ferdinandiana): The good (ellagic), the bad (oxalic) and the uncertain (ascorbic). Food Research International, Vol. 89 (2016). Measured ascorbic acid in fruit from six individual trees at 85 to 25,667 mg per 100 g dry weight, and placed the fruit in the high-oxalate category with an oxalate-to-calcium ratio above 2.
4. Phytochemical divergence in 45 accessions of Terminalia ferdinandiana (Kakadu plum). Food Chemistry, Vol. 151 (2014). Reported a mean of 15,190 mg vitamin C per 100 g dry weight across 45 samples, with significant variability attributed to genetics, geography, climate and soil.
5. Acerola, an untapped functional superfruit: a review on latest frontiers. Journal of Food Science and Technology, Vol. 55, Issue 9 (2018). Reported acerola's ascorbic acid across a range of 1,500 to 4,500 mg per 100 g, around 50 to 100 times that of an orange or lemon.
6. Ascorbic acid metabolism is influenced by oxidation, recycling, synthesis and transport during fruit development of Malpighia emarginata. Theoretical and Experimental Plant Physiology (2023) [journal details not confirmed]. Found total ascorbic acid in acerola declined about 60% between immature green fruit and fully ripe fruit.
7. Nutritional composition and vitamin C stability in stored camu-camu (Myrciaria dubia) pulp. Archivos Latinoamericanos de Nutrición, Vol. 50, Issue 4 (2000). Found Amazonian camu camu pulp at 2,400 to 3,000 mg per 100 g against roughly 1,400 mg for fruit grown in Paraná, with 26% lost across 335 days of frozen storage.
8. Effect of cooking methods on the nutritional quality of selected vegetables at Sylhet City. [journal details not confirmed] (2023). Measured vitamin C losses from boiling ranging from 9.83% to 70.88% across the vegetables tested, with leafy greens most affected.
9. Vitamin C — Fact Sheet for Health Professionals. National Institutes of Health, Office of Dietary Supplements (updated 2025). Source for the adult RDA, the additional 35 mg a day for people who smoke, the 2,000 mg tolerable upper intake level, the absorption figures and the food content table.
10. Acerola, (west indian cherry), raw — FoodData Central. U.S. Department of Agriculture, Agricultural Research Service. Lists acerola at approximately 1,677 mg vitamin C per 100 g, the highest of the contender fruits present in the US reference database.
11. Nutrients: Vitamin C, total ascorbic acid (mg) — foods ranked by nutrient content. USDA National Nutrient Database for Standard Reference, hosted by NIH Office of Dietary Supplements. The standardised ranked list of foods by vitamin C content, which does not include camu camu, Kakadu plum or sea buckthorn.

About the Author

David Kimbell is a health writer, digital entrepreneur and former aerospace engineer, based in Ottawa, Canada. He loves translating complex science into clear, actionable guidance for consumers seeking evidence-based solutions.

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Important Disclaimers

Medical Disclaimer: This article provides educational information only and is not intended as medical advice. Always consult with a qualified healthcare provider before starting any new supplement, especially if you have existing health conditions, take medications, or are pregnant or nursing.

FDA/Health Canada Statement: These statements have not been evaluated by the Food and Drug Administration or Health Canada. This product is not intended to diagnose, treat, cure, or prevent any disease.