Vitamin C ： Upper Respiratory Tract Infections
BResearch suggests regular vitamin C supplementation may reduce cold duration by approximately 8% in adults and 14% in children. Supplementation at 1g+/day is associated with reduced severity of cold symptoms. Notably, vitamin C started after symptom onset does not appear to be effective.
結論
Research suggests regular vitamin C supplementation may reduce cold duration by approximately 8% in adults and 14% in children. Supplementation at 1g+/day is associated with reduced severity of cold symptoms. Notably, vitamin C started after symptom onset does not appear to be effective.
Key Study Findings
対象集団: Elite/professional cyclists nutrition review
対象集団: Children with inflammatory bowel disease (review)
対象集団: Large genetic cohort (MR analysis)
対象集団: COVID-19 patients with gut dysbiosis
対象集団: Broiler chickens
対象集団: None
Key Statistics
30
研究数
10000
参加者数
Positive
グレード
Referenced Papers
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
一般的な使用量
- general:
- 75-90 mg/day
- acuteillness:
- 1,000-2,000 mg/day
- immunesupport:
- 200-1,000 mg/day
上限量： 2,000 mg/day
研究で検討された用量
| 用量 | 期間 | 効果 | N |
|---|---|---|---|
| None | -- | Mixed | -- |
| None | -- | Neutral | -- |
| 12 circulating micronutrients | -- | Mixed | -- |
| Probiotics, nutraceuticals | -- | Positive | -- |
| None | -- | Positive | -- |
| 12.5 billion cfu/d | 24 weeks | Mixed | 171 |
| 45% | 988 weeks | Positive | 26282 |
| None | 13.0 weeks | Mixed | 3135 |
推奨摂取タイミング： With meals; divide doses >500 mg for better absorption
Safety & Side Effects
報告されている副作用
- ⚠ Gastrointestinal distress (nausea, diarrhea, cramps) at high doses
- ⚠ Increased risk of kidney stones in susceptible individuals
- ⚠ Interference with certain lab tests (glucose, occult blood)
- ⚠ Iron overload risk in hemochromatosis patients
既知の相互作用
- ● Enhances non-heme iron absorption (beneficial or harmful depending on iron status)
- ● High doses may reduce effectiveness of certain chemotherapy agents
- ● May interfere with anticoagulant therapy (warfarin) at high doses
- ● Aluminum-containing antacids (increased aluminum absorption)
耐容上限摂取量： 2,000 mg/day
サプリメントの摂取を開始する前に、必ず医療専門家にご相談ください。
Frequently Asked Questions
Does Vitamin C help with Upper Respiratory Tract Infections?
How much Vitamin C should I take for Upper Respiratory Tract Infections?
Are there side effects of Vitamin C?
How strong is the evidence for Vitamin C and Upper Respiratory Tract Infections?
Related Evidence
に関する他の成分： Upper Respiratory Tract Infections
Vitamin C 他の症状・状態について
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