Oranges: the fruit, the juice, and the 200 mg threshold

One orange of 154 g carries about 86.5 mg of vitamin C, which is 96 percent of the Daily Value, and 3.4 g of fibre. Then comes the thing everyone believes about it. The Cochrane review of vitamin C and the common cold pooled 29 comparisons covering 11 306 people. In the general community trials, 10 708 of them, daily supplements did not stop anyone catching a cold, and the pooled risk ratio was 0.97. Colds ran 8 percent shorter in adults and 14 percent shorter in children. Started after symptoms began, vitamin C did nothing consistent. And that review excluded every trial using less than 200 mg a day, so even the small effect it found was measured at more than twice what an orange delivers. The one group whose risk of catching a cold really fell were marathon runners, skiers and soldiers on subarctic exercises. Most of the rest of the evidence here is about juice at half a litre a day. Europe examined a dossier claiming orange juice strengthens the immune system and refused it.

The numbers, per 100 g

How much is actually in it

• British and American orange figures look far apart until you check the sample spread and what each country counts as fibre. — USDA Oranges, raw, navels (FDC 746771, Foundation) and 5 USDA records overall, against CoFID Oranges, flesh only (code 14-327) (n = 8 Foundation samples for vitamin C, 4 for fibre) Evidence E source
  Vitamin C 59.1 mg per 100 g in USDA against 52 mg in CoFID, a 12% gap, while the USDA Foundation samples themselves run 51.8 to 65.6 across 8 samples, so the British value sits inside the American spread; fibre 2.2 g in USDA against 1.2 g CoFID AOAC fibre, a 40% gap on the face of it, except that CoFID also publishes NSP at 1.7 g for the same food, which is a different definition of fibre rather than a different orange

What a real portion looks like

• One orange covers nearly the whole day's vitamin C and about an eighth of the day's fibre. — one FNDDS food with four household measures (n = fdc_id 2709171) Evidence E source
  Vitamin C 56.2 mg per 100 g and fibre 2.2 g per 100 g; 1 fruit = 154 g = 86.5 mg vitamin C, which is 96% of the 90 mg Daily Value, and 3.4 g of fibre; 1 section or slice = 15 g = 8.4 mg; 1 cup = 180 g = 4.0 g fibre

What your body absorbs

• Among premenopausal women, fruit and juice low in fibre went with higher iron stores, and fibre-rich ones did not. — 4358 adults aged 35 to 60 from the SU.VI.MAX cohort, analysed by sex and menopausal status (n = 4358) Evidence C source
  In premenopausal women serum ferritin was up to 10% higher in the top tertile of fibre-poor fruit, vegetable and juice intake than in the bottom tertile; across the whole sample haemoglobin was up to 1.5 g/L higher with fruits, vitamin C-rich items, dietary ascorbic acid and fibre-poor items

What cooking and storage change

• The USDA cooking table says almost nothing about oranges because it writes citrus out of most of its fruit rows. — group 9, Fruits and Fruit Juices; 13 method rows carry a vitamin C factor (n = 13 method rows) Evidence E source
  The rows for fresh fruit sauteed, stewed, baked and broiled are all labelled FRUITS,FRESH(NOT CITRUS), which excludes oranges by name; what remains applicable is dried at 20% retention, canned at 50% and frozen at 70%

What it does to your health

• Taking vitamin C every day does not stop people catching colds, and it shortens a cold by about a twelfth at over 200 mg a day as a supplement, which is more than twice what an orange holds. — 29 trial comparisons with 11306 participants for cold incidence, of which general community trials covered 10708 people, plus 31 comparisons covering 9745 cold episodes for duration and 7 comparisons covering 3249 episodes for treatment started after symptoms began (n = 11306) Evidence A source
  In the general community the pooled risk ratio for catching a cold was 0.97 (95% CI 0.94 to 1.00); in 5 trials of 598 marathon runners, skiers and soldiers on subarctic exercises it was 0.48 (95% CI 0.35 to 0.64); regular supplementation shortened colds by 8% (3 to 12%) in adults and 14% (7 to 21%) in children, and 1 to 2 g a day shortened children's colds by 18%; vitamin C started after symptoms appeared showed no consistent effect
• The flavonoid that orange juice is usually credited to did nothing on its own in ten trials. — 577 participants across 10 randomised controlled trials (n = 577) Evidence A source
  No effect on total cholesterol (WMD -1.04 mg/dl, 95% CI -5.65 to 3.57), LDL (-1.96, -7.56 to 3.64), HDL (0.16, -1.94 to 2.28), triglycerides (0.69, -5.91 to 7.30), systolic blood pressure (-0.85 mmHg, -3.07 to 1.36) or diastolic blood pressure (-0.48 mmHg, -2.39 to 1.42), with no significant heterogeneity between studies

Safety, limits and interactions

• Orange juice lowered LDL cholesterol and fasting glucose across ten randomised trials, and the effect holds at half a litre a day and upward, which is around 225 kcal of sugar a day with the fibre taken out. — 10 randomised controlled trials of orange juice consumption reporting cardiovascular disease risk factors (n = 10 randomised controlled trials) Evidence A source
  Glucose fell 2.92 mg/dL (95% CI -5.327 to -0.530, p = 0.017), insulin 1.229 µU/ml (-2.083 to -0.374, p = 0.005), HOMA-IR 0.464 (-0.747 to -0.181, p = 0.001), total cholesterol 9.84 mg/dL (-15.43 to -4.24, p = 0.001), LDL 9.14 mg/dL (-15.79 to -2.49, p = 0.007) and CRP 0.467 mg/l (-0.815 to -0.120, p = 0.008); body composition and the remaining risk factors did not move, and the glucose, HOMA-IR, total cholesterol and LDL effects were robust in the subgroup drinking 500 ml a day or more

What people believe that the data does not support

• Europe refused the claim that orange juice strengthens the immune system. — food labelling in the European Union Evidence E source
  Status Non-authorised; all three register entries mentioning orange are non-authorised and none is authorised

What is still unknown

• The United States allows fruit to carry a cancer claim while stating inside the same rule that nobody agrees on why fruit helps. — food labelling in the United States Evidence E source
  The regulation records that many studies associate diets high in plant foods with reduced risk of some cancers, and then states there is no scientific agreement on whether the protective effect comes from the nutrient components, from displacement of fat, or from non-nutrient substances in these foods

The bottom line

Orange juice does move blood markers, and the dose that carries the result is the part to read. Pooling 10 randomised trials, juice lowered fasting glucose by 2.92 mg/dL, LDL by 9.14 mg/dL, total cholesterol by 9.84 mg/dL and CRP slightly, and the glucose, cholesterol and LDL effects held up in the subgroup drinking 500 ml a day or more. Half a litre of orange juice is around 225 kcal of sugar with the fibre taken out, drunk daily for weeks, and none of these outcomes is an event that happened to a person. Ten trials is a small pool. The usual explanation for that result has been tested on its own and failed. Hesperidin, the citrus flavonoid orange juice is normally credited to, did nothing to total cholesterol, LDL, HDL, triglycerides or blood pressure across 10 trials and 577 people, with narrow confidence intervals and no heterogeneity between studies. Whatever juice is doing, the isolated flavonoid story does not survive testing. There is a smaller finding about iron worth knowing if you are premenopausal. In a French cohort of 4 358 adults, women before menopause who ate the most fibre-poor fruit, vegetables and juice had up to 10 percent higher ferritin than those who ate the least, and the fibre-rich ones showed no such association. This is a cross-sectional regression inside a cohort, the differences are small, and the authors say the vitamin C explanation does not account for their own haemoglobin result. Nothing in it tested eating an orange with a plant iron meal, and nobody in that cohort was asked to, so it describes what people already ate and is not a reason to start doing anything. Two notes on the numbers themselves. American and British tables look 40 percent apart on fibre in an orange, 2.2 g against 1.2 g, until you notice the British tables also publish 1.7 g for the same food under a different definition of fibre. Vitamin C looks 12 percent apart, 59.1 mg against 52 mg, and the eight American samples alone run from 51.8 to 65.6, so the British figure sits inside the American spread. And the USDA cooking table has almost nothing to say about this fruit, because its rows for fresh fruit baked, broiled, stewed and sauteed are labelled not citrus. What is left is dried at 20 percent retention, canned at 50 percent and frozen at 70 percent. The question people actually ask, how much vitamin C a squeezed juice loses standing on the counter, is not answered by that table and we did not find it in the corpus either. One last thing, because it is the rare case of a regulator naming its own uncertainty. American law lets fruit carry a cancer health claim, and the text of that same rule states there is no scientific agreement on whether the protection comes from the nutrients, from displacing fat, or from other substances in the food. The claim covers fruits and vegetables as a class, and it declines to hand the credit to vitamin C.

Sources

1. org-p1-07 · reference dataset comparison
   USDA Oranges, raw, navels [FDC 746771, foundation] вітамін C 59.1 мг, зразки Foundation 51.8-65.6 n=8; клітковина 2.2 г || CoFID Oranges, flesh only [14-327] Vitamin C (mg) 52 · AOAC fibre (g) 1.2 · NSP (g) 1.7 · Copper (mg) 0.03
   USDA FoodData Central (FDC 746771) and CoFID 2021, Public Health England / OGL v3.0 (code 14-327) · checked 2026-09-22
2. org-p1-08 · reference dataset
   Orange, raw · Vitamin C, total ascorbic acid 56.2 MG на 100 г [fdc_id 2709171] · 1 fruit 154 г 86.5 MG · 1 section/slice 15 г 8.4 MG || Fiber, total dietary 2.2 G на 100 г [fdc_id 2709171] · 1 fruit 154 г 3.4 G · 1 cup 180 г 4.0 G
   USDA FNDDS 2021-2023, Orange, raw (fdc_id 2709171) · checked 2026-09-22
3. org-p1-04 · cross-sectional analysis within a randomised cohort
   In premenopausal women, serum ferritin was positively associated with intakes of fiber-poor FVJ (up to 10% higher serum ferritin in the third tertile compared with the first tertile).
   The American Journal of Clinical Nutrition, 2008 · checked 2026-09-22
4. org-p1-09 · reference dataset
   vitamin_c_mg · група 9 Fruits and Fruit Juices · 158 FRUITS,DRIED — 20% · 154 FRUITS,CANNED — 50% · 156 FRUITS,FROZEN — 70% · 153 FRUITS,FRESH(NOT CITRUS),SAUTEED — 70% · 151 FRUITS,FRESH(NOT CITRUS),BAKED — 80% · 152 FRUITS,FRESH(NOT CITRUS),BROILED — 80%
   USDA Table of Nutrient Retention Factors, Release 6 (2007) · checked 2026-09-22
5. org-p1-01 · Cochrane systematic review and meta-analysis of randomised placebo-controlled trials
   In the general community trials involving 10,708 participants, the pooled RR was 0.97 (95% confidence interval (CI) 0.94 to 1.00). Five trials involving a total of 598 marathon runners, skiers and soldiers on subarctic exercises yielded a pooled RR of 0.48 (95% CI 0.35 to 0.64).
   Cochrane Database of Systematic Reviews, 2013 · checked 2026-09-22
6. org-p1-03 · systematic review and meta-analysis of randomised controlled trials
   The meta-analysis revealed that hesperidin supplementation had no effect on serum total cholesterol (weighted mean difference [WMD] = -1.04 mg/dl; 95% confidence interval [CI]: -5.65, 3.57), low-density lipoprotein cholesterol (WMD = -1.96 mg/dl; 95% CI [-7.56, 3.64]), high-density lipoprotein cholesterol (WMD = 0.16 mg/dl; 95% CI [-1.94, 2.28]), and triglyceride (WMD = 0.69 mg/dl; 95% CI [-5.91, 7.30]), with no significant between-study heterogeneity.
   Phytotherapy Research, 2019 · checked 2026-09-22
7. org-p1-02 · systematic review and meta-analysis of randomised controlled trials
   Pooled results demonstrated a significant effect of orange juice on glucose (WMD: -2.92 mg/dl, 95% CI: -5.327, -0.530, p = 0.017), insulin (WMD: -1.229 μU/ml, 95% CI: -2.083, -0.374, p = 0.005), HOMA-IR (WMD: -0.464, 95% CI: -0.747, -0.181, p = 0.001), total cholesterol (WMD: -9.84 mg/dl, 95% CI: -15.43, -4.24, p = 0.001), LDL-C (WMD: -9.14 mg/dl, 95% CI: -15.79, -2.49, p = 0.007), and CRP (WMD: -0.467 mg/l, 95% CI: -0.815, -0.120, p = 0.008) compared to control group.
   Critical Reviews in Food Science and Nutrition, 2022 · checked 2026-09-22
8. org-p1-06 · regulatory register entry
   POL-HC-7000 Cryptoxanthin from orange juice (Cryptoxanthin from) orange juice participate to strengthen immune system. Clarification provided (Cryptoxanthin from) orange juice ensure antioxidant action / ensure protective effect on the organism. Non-authorised
   EU Register on nutrition and health claims, заява POL-HC-7000, знімок 2026-09-21 · checked 2026-09-22
9. org-p1-05 · regulatory provision
   Currently, there is not scientific agreement as to whether the observed protective effects of fruits and vegetables against cancer are due to a combination of the nutrient components of diets rich in fruits and vegetables, including but not necessarily limited to dietary fiber, vitamin A (as beta-carotene) and vitamin C, to displacement of fat from such diets, or to intakes of other substances in these foods which are not nutrients but may be protective against cancer risk.
   21 CFR 101.78, Health claims: fruits and vegetables and cancer · checked 2026-09-22