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Vitamin C: Oral vs. Intravenous, Immune Effects, Cancer, Exercise Adaptation & More

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Rhonda Patrick1h 19m · 2020-05-13

Support Rate

64%

132 of 205 claims supported

Support rate

132 of 205 claims supported

132 supported73 partial / not

Claims from this content

135

Well SupportedIn a trial for sepsis and ARDS, patients receiving intravenous vitamin C had approximately 30% mortality, compared to over 46% in the placebo group.Partially SupportedIntravenous vitamin C can achieve plasma concentrations up to 68 times higher than can be achieved through oral consumption.Not SupportedVitamin C intake above 30-70mg per day may not provide benefits for humans and higher doses might be dangerous due to conversion to oxalate.Not SupportedHigh doses of vitamin C can act as pro-oxidants in individuals with G6PD deficiency, potentially causing hemolysis.Well SupportedVitamin C facilitates neutrophil migration and supports neutrophil function by acting as an antioxidant.

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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.

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Well SupportedVitamin C supplementation normalized cytokine production in vitamin C deficient mice with increased pro-inflammatory cytokines.

Well SupportedIntravenous vitamin C has 30-70 times higher bioavailability than oral vitamin C.

Partially SupportedSupplementation of vitamin C might affect exercise-induced oxidative stress and training adaptations differently depending on an individual's baseline vitamin C levels.

Not SupportedTaking high-dose vitamin C can suppress the insulin sensitivity effects of exercise.

Well SupportedLow vitamin C levels may contribute to increased fat storage because vitamin C is essential for carnitine synthesis.

Well SupportedVitamin C intakes above the Recommended Dietary Allowance (RDA) for oral vitamin C are generally well-tolerated and safe for most people, despite the 2,000mg upper limit.

Well SupportedMeat is generally a poor source of vitamin C, with most beef items containing only tiny amounts, though some organ meats contain slightly more.

Well SupportedVitamin C is protective against lung cancer, with a 7% decrease in lung cancer risk for men for every 100mg increase in daily intake.

Well SupportedHigh-dose intravenous vitamin C selectively kills cancer cells by increasing hydrogen peroxide.

Partially SupportedSteady-state plasma vitamin C concentrations from consuming 5-9 servings of vitamin C-rich fruits and vegetables daily are around 80 micromoles per liter or less.

Partially SupportedThere is no definitive proof that vitamin C supplementation increases kidney stones in individuals who do not tolerate oxalates well at doses below 500mg.

Partially SupportedIntravenous vitamin C has significantly higher bioavailability than oral vitamin C.

Not SupportedConsistently taking synthetic Vitamin C supplements is associated with a two times higher risk of developing kidney stones.

Partially SupportedThe effectiveness of vitamin C in preventing or decreasing the common cold varies due to factors like age, dose, frequency, and duration of supplementation.

Partially SupportedThe common cold is the most extensively studied infection regarding vitamin C, with control trials typically using one gram per day.

Partially SupportedLiposomal vitamin C doses below 5 grams achieve similar plasma concentrations as non-liposomal vitamin C.

Partially SupportedMany clinical studies suggest a beneficial use for intravenous vitamin C as adjunctive therapy for cancer, with findings indicating a trend in overall survival rate.

Partially SupportedSupplementation with vitamin C reduced the incidence of colds by 50% in trials involving athletes and soldiers.

Partially SupportedVitamin C depletion during exercise is associated with 25% lower fat utilization.

Well SupportedCooking plant foods can cause significant loss of vitamin C, while cooked animal foods show no known significant loss of vitamin C.

Partially SupportedOral vitamin C may play a role in fertility by decreasing reactive oxygen species and increasing sperm count and motility.

Partially SupportedVitamin C supplementation (200mg/day) may improve respiratory function in elderly patients with bronchitis or bronchopneumonia who have low baseline vitamin C levels.

Partially SupportedIntravenous vitamin C appears to improve cancer patients' quality of life.

Partially SupportedSupplementing at least 2 grams of vitamin C per day during a cold was more beneficial than 1 gram per day.

Partially SupportedExcess exercise-induced reactive oxygen species (ROS) can promote immune dysfunction, with the extent varying by exercise duration and intensity.

Partially SupportedVitamin C may enhance exercise performance by reducing negative consequences of excess reactive oxygen species.

Partially SupportedIntravenous vitamin C is generally well-tolerated with low toxicity, with common side effects including mild to moderate nausea, headache, and dry mouth.

Partially SupportedTo achieve a measurable effect from vitamin C supplementation, plasma levels must be significantly raised above normal steady-state levels.

Well SupportedHigh-dose intravenous vitamin C (e.g., 50 grams) is used in cancer treatment protocols but is rapidly filtered by the kidneys.

Partially SupportedMen with low baseline vitamin C levels (around 35 µmol/L) had lower VO2 max compared to those with high levels (around 78 µmol/L), but supplementation with 1g/day vitamin C for 30 days reduced oxidative stress biomarkers in the low-level group.

Partially SupportedHigh-intensity exercise is linked to an increased incidence of upper respiratory infections due to high reactive oxygen species production.

Well SupportedExercise benefits such as improved insulin sensitivity are negated by co-administration of antioxidants (Vitamin C and E).

Partially SupportedThe RDA for vitamin C aims to maintain an optimal blood concentration of approximately 50 micromoles per liter to prevent LDL cholesterol oxidation.

Partially SupportedVitamin C can decrease the duration of mechanical ventilation in patients experiencing respiratory failure.

Partially Supported500mg/day of vitamin C for 8 weeks significantly decreased blood pressure in hypertensive individuals.

Well SupportedHumans cannot synthesize vitamin C and must obtain it from their diet or supplements.

Well SupportedHigh-dose IV vitamin C infusion in G6PD deficient patients can lead to hemolysis, indicating a pro-oxidant effect.

Partially SupportedSmoking increases oxidative stress, thereby increasing antioxidant needs.

Partially SupportedHigh-dose vitamin C selectively kills tumor cells and starves cancer cells of energy.

Partially SupportedVitamin C functions as a cofactor for enzymes involved in brain function and as an antioxidant.

Partially SupportedSupplemental vitamin C may mitigate symptoms associated with exercise-induced bronchoconstriction.

Partially SupportedHigh oral doses of vitamin C may increase the risk of kidney stones due to oxalate formation.

Partially SupportedVitamin C may enhance the immune system by promoting T cell proliferation and preventing T cell death.

Not SupportedTherapeutic doses of vitamin C at the onset of cold symptoms had no effect on symptom or duration.

Not SupportedSupplementation with vitamin C and vitamin E together appears to blunt cellular adaptations to exercise, such as mitochondrial biogenesis.

Partially SupportedSupplementing with vitamin C showed a statistically significant increase in kidney stone risk, but the clinical significance is negligible.

Partially SupportedVitamin C is not a cure for COVID-19, and data on intravenous administration is not yet available.

Limited ResearchIt is unclear whether vitamin C alone, separate from vitamin E, would blunt exercise-induced insulin sensitivity, as studies often include both antioxidants.

Partially SupportedA study with 20 people showed that a single 10 gram dose of liposomal vitamin C increased plasma levels to 300 micromoles per liter.

Partially SupportedDoses of oral vitamin C up to 3 grams can produce transient peak plasma concentrations two to threefold higher than 200 mg, returning to baseline after 24 hours.

Partially SupportedGenetic variations in genes encoding sodium-dependent vitamin C transporters can affect an individual's vitamin C absorption.

Partially SupportedOral vitamin C absorption in the small intestine primarily occurs via sodium-dependent vitamin C transporters (SVCTs) and secondarily via glucose transporters.

Partially SupportedIn smokers aged 55+, vitamin C intake of 54mg per increase is associated with a 35% risk decrease for Alzheimer's disease.

Partially SupportedNeutrophils consume large amounts of vitamin C when activated to release oxidants and absorb vitamin C to protect themselves from self-damage.

Partially SupportedDehydroascorbic acid can be recycled intracellularly back to ascorbate approximately four times per molecule.

Partially SupportedA combination of 1 gram of vitamin C and 450mg of magnesium chelate daily for 16 weeks showed no beneficial effects on asthma control outcomes.

Partially SupportedSixty percent of hospitalized patients have low vitamin C levels, and 19% are deficient to a degree approaching scurvy levels.

Partially SupportedVitamin C, also known as ascorbic acid, is an essential nutrient recognized for its antioxidant properties.

Partially SupportedSevere vitamin C deficiency (scurvy) can manifest within three months and is characterized by symptoms like bleeding gums, poor wound healing, joint pain, and bruising.

Partially SupportedAfter absorption, vitamin C concentrations are highest in the brain and adrenal glands, and lowest in muscle, heart, and kidneys.

Partially SupportedAntioxidant supplementation, including vitamin C and E, may blunt exercise-mediated improvements in insulin sensitivity.

Partially SupportedIntravenous vitamin C has been used to treat viral infections like shingles and mononucleosis, though clinical studies are lacking for herpes.

Partially SupportedProphylactic vitamin C doses (200mg to 2g daily for 2 weeks to 6 months) decreased the relative risk of catching a cold by 4%.

Partially SupportedVitamin C has no significant effect on the duration of mechanical ventilation for patients on ventilators for less than 24 hours.

Partially SupportedThe established tolerable upper intake for oral vitamin C is 2,000 milligrams per day due to potential GI problems like diarrhea.

Not SupportedPeople with hemochromatosis or abnormally high iron levels should be cautious with vitamin C supplementation because it can improve dietary iron absorption.

Partially SupportedIn patients with mononucleosis, intravenous vitamin C was associated with decreased viral titers and replication, but also a decrease in antibody levels.

Partially SupportedVitamin C deficiency is associated with increased pro-inflammatory cytokines in mice.

Not SupportedPharmacologic doses of intravenous vitamin C (greater than 1 gram) can generate hydrogen peroxide, which can damage DNA, RNA, and proteins.

Partially SupportedHigh levels of vitamin C in immune cells protect them from reactive oxygen species induced DNA damage and promote neutrophil ROS production during infection.

Partially SupportedDaily 500mg vitamin C and 400 IU vitamin E supplementation for 16 weeks had no effect on insulin sensitivity in 21 physically active men.

Partially SupportedOral vitamin C bioavailability is dependent on both frequency and dose.

Partially SupportedThe discussion on vitamin C will cover food sources, recommended oral intakes, deficiency effects, roles in the body (antioxidant, immune function), metabolic disposition, intravenous administration for therapeutic strategies, viral defense, bioavailability differences in various forms (including liposomal), potential blunting of exercise effects, improvement of severe viral infection outcomes, role in fatty acid oxidation, kidney stone risk, and effects on the common cold.

Not SupportedLow vitamin C intake and deficiencies impair biological processes, increasing the risk for decreased fat utilization during exercise and increased severity of Alzheimer's disease.

Partially SupportedLinus Pauling proposed that high-dose intravenous vitamin C is useful as a supportive treatment for cancer and for mitigating chemotherapy side effects.

Limited ResearchMore randomized placebo-controlled studies are needed to determine if vitamin C improves asthma symptoms and severity, and if outcomes are affected by dose, age, or baseline vitamin C levels.

Limited ResearchMore randomized placebo-controlled studies are needed to determine the effectiveness and duration of effects of intravenous vitamin C in reducing blood pressure.

Partially SupportedAntioxidant supplementation increased antioxidant defenses and neutrophil function in athletes.

Limited ResearchVitamin C may increase the incidence of pneumonia in individuals with very low plasma levels of vitamin C.

Partially SupportedOxidation can lead to oxidative stress when too many oxidized molecules accumulate, which is a key driver of many chronic diseases.

Partially SupportedSome scientists propose increasing the Recommended Dietary Allowance for vitamin C to 200 mg/day for adults to reduce chronic disease risk.

Partially SupportedFuture studies with consistent and equivocal designs are needed to fully understand the health benefits of vitamin C.

Partially SupportedCancer cells may have lower levels of enzymes involved in detoxification of reactive oxygen species compared to healthy cells.

Partially SupportedPeople with the highest baseline vitamin C levels also had lower risk factors for respiratory diseases.

Partially SupportedSupplemental vitamin C doses of 1-2 grams per day for 1-2 weeks did not improve immune function before or after prolonged exercise in most studies, but results were more promising in high-endurance athletes when vitamin C was combined with other antioxidants.

Partially SupportedEndurance athletes and children appear to benefit most from prophylactic vitamin C doses.

Partially SupportedLow vitamin C levels in sepsis patients may predict increased risk for organ failure.

Partially SupportedPrenatal and postnatal vitamin C deficiency in guinea pigs stunted hippocampal development by 10-30%.

Partially SupportedAn overly restrictive diet focused solely on meat could potentially lead to vitamin C deficiency.

Partially SupportedVitamin C may be protective against many respiratory diseases.

Partially SupportedPregnancy and breastfeeding increase vitamin C requirements.

Partially SupportedGenetic polymorphisms can affect vitamin C transport.

Partially SupportedHigher doses of vitamin C supplementation were more effective against colds in children under 16 compared to adults.

Partially SupportedThe brain prioritizes retaining vitamin C during deficiency, even at the expense of other tissues.

Partially SupportedVitamin C and its metabolites are primarily excreted in the urine, with urinary excretion directly proportional to plasma concentrations.

Partially SupportedDehydroascorbic acid competes with glucose for uptake, and its uptake may be reduced in individuals with high blood glucose levels.

Partially SupportedAlcohol consumption increases urinary vitamin C losses by nearly 50%, potentially requiring higher intake to prevent deficiency.

Partially SupportedAbsorption of vitamin C via sodium-dependent vitamin C transporters is dose-dependent and subject to transport saturation.

Partially SupportedConsuming less than 10 milligrams of vitamin C daily may cause scurvy.

Partially SupportedExercise-induced bronchoconstriction is characterized by a 10% or greater decline in forced expiratory volume (FEV1) in response to intense exercise.

Partially SupportedVitamin C protects proteins, lipids, carbohydrates, DNA, and RNA from oxidative damage by donating electrons.

Partially SupportedVitamin C levels are higher in fetuses and full-term babies than in adults.

Partially SupportedHigher intakes of vitamin C, especially from supplements, are associated with a reduced risk of acute and chronic diseases.

Partially SupportedTaking 0.5-2 grams of vitamin C immediately before exercise for two weeks reduced the decline in FEV1 by more than 8% in individuals aged 7-28 years.

Partially SupportedVitamin C exhibits a dose-dependent effect against influenza viruses in vitro, with 2.5 millimoles per liter eliminating 90% of the virus and 20 millimoles per liter fully blocking replication.

Partially SupportedSuccessive treatments with high-dose intravenous vitamin C do not increase pro-oxidative markers in healthy people.

Partially SupportedThe Recommended Dietary Allowance for vitamin C is 90 mg/day for men and 75 mg/day for women, with needs varying by age, sex, and life stage.

Partially SupportedVitamin C's immune-boosting and antioxidant properties can mediate the body's inflammatory response, reducing symptoms or risk of various diseases.

Partially SupportedA single dialysis session can reduce plasma vitamin C levels in patients with renal failure by approximately half compared to pre-dialysis levels.

Partially SupportedVitamin C supplementation reduced weight gain, particularly fat mass, in mice fed a high-fat, high-sugar diet compared to those not supplemented.

Partially SupportedVitamin C doses of 150-900mg/day, combined with vitamins E and beta-carotene, enhanced neutrophil function and reduced exercise-induced oxidative damage in trained runners.

Partially SupportedVitamin C supplementation in a mouse model of Werner syndrome extended lifespan and corrected age-related metabolic diseases.

Partially SupportedVitamin C's antioxidant capacity may reduce the risk of neurodegenerative diseases by decreasing brain oxidative damage.

Partially SupportedVitamin C may be beneficial for critically ill individuals with viral infections who have low blood vitamin C levels.

Partially SupportedSupplemental vitamin C doses ranging from 400 mg to 3 g per day have decreased markers of muscle damage and reduced muscle soreness after exercise.

Partially SupportedMedical conditions like inflammatory bowel diseases and kidney failure increase a person's vitamin C needs.

Partially SupportedVitamin C is a potent antioxidant and a critical component of the immune system, participating in numerous biological processes.

Partially SupportedIntravenous vitamin C can interfere with viral replication by decreasing reverse transcriptase activity and p24 antigen levels.

Partially SupportedSmokers and alcohol drinkers have higher vitamin C needs than non-users due to increased oxidative stress and urinary losses, respectively.

Partially SupportedMeta-analyses demonstrate an effect of vitamin C supplementation, particularly with higher doses, despite trial design inadequacies.

Partially SupportedIntravenous vitamin C combined with conventional therapy is more effective than conventional therapy alone for treating viral myocarditis in children.

Partially SupportedIdeal vitamin C trial designs should assess blood kinetics based on dosing every few hours after symptom onset and utilize larger doses up to 3 grams.

Partially SupportedVitamin C is found in high concentrations in the brain, particularly in the hippocampus and frontal cortex, which are important for memory, learning, and executive function.

Partially SupportedOne gram of vitamin C daily for two months decreased C-reactive protein by nearly 17% compared to pre-treatment measurements in healthy adults with elevated baseline levels.

Partially SupportedVitamin C may protect the lungs by boosting immune cell function and reducing oxidative stress.

Partially SupportedIntravenous vitamin C may decrease inflammation and pain in rheumatoid arthritis patients.

Partially SupportedVitamin C supplementation (1 gram daily for 14 weeks) may lead to fewer and less severe asthma attacks.

Partially SupportedGuavas, kiwis, and bell peppers contain higher amounts of vitamin C than citrus fruits.

Partially SupportedIntravenous vitamin C may reduce pain associated with chickenpox or shingles.

Partially SupportedThe brain prioritizes retaining vitamin C during deficiency at the expense of other tissues.