维生素 B12 用于 休止期脱发
F基于13项研究，共8,121名参与者。各研究结果不一。
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F
结论
Research does not clearly support vitamin B12 supplementation for telogen effluvium — while low B12 is sometimes found in hair loss patients, there is no strong evidence that supplementation helps recovery.
- Mixed results across 13 observational studies
- Some post-COVID hair loss studies measured B12 levels without finding consistent patterns
- No RCTs testing B12 supplementation for telogen effluvium
- Only worth supplementing if a blood test confirms a B12 deficiency
Key Study Findings
retrospective observational
n=113
Telogen Effluvium Following Coronavirus Disease-2019 Infection: A Retrospective Study of 113 Cases.
Dose: None
vs: Placebo
效果: None
None
Retrospective cohort
n=2851
Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience.
Dose: None
vs: Placebo
效果: Ferritin low in 46.5% of patients; iron deficiency in 29.5%
p<0.05
Cross-Sectional Study
n=108
Evaluation of the relationship of digital phototrichogram findings of patients with diffuse hair loss with …
Dose: None
vs: Placebo
效果: None
0.05
case-control study
n=180
A comprehensive investigation of biochemical status in patients with telogen effluvium: Analysis of Hb, ferritin, …
Dose: not applicable
vs: Placebo
效果: None
None
Case-control
n=973
Micronutrient Deficiencies and Digital Computerized Phototrichogram Analysis in Telogen Effluvium: a Retrospective Correlation Study in …
Dose: None
vs: Placebo
效果: r=0.417 (HGB and AHR in females)
p=0.008
retrospective cross-sectional study
n=467
Nonscarring scalp alopecia: Which laboratory analysis should we perform on whom?
Dose: not applicable
vs: Placebo
效果: None
0.001
Key Statistics
13
研究数量
8121
受试者
↔
Mixed
F
等级
Referenced Papers
Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience.
Other
Journal of cosmetic …
2025
4 次引用
Telogen Effluvium Following Coronavirus Disease-2019 Infection: A Retrospective Study of 113 Cases.
Other
International journal of …
2025
Journal of cosmetic …
2024
7 次引用
Northern clinics of …
2024
1 次引用
Dermatology practical & …
2023
4 次引用
Journal of cosmetic …
2022
22 次引用
Turkish journal of …
2022
8 次引用
NonScarring Diffuse Hair Loss in Women: a Clinico-Etiological Study from tertiary care center in North-West India.
Observational
Journal of cosmetic …
2019
25 次引用
Journal of drugs …
2016
56 次引用
Dermatology research and …
2016
26 次引用
Acta dermatovenerologica Croatica …
2016
6 次引用
Clinical and experimental …
2009
34 次引用
Dermatologic clinics
1993
38 次引用
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
常用剂量
- general:
- 2.4 mcg/day
- deficiency:
- 1,000-2,000 mcg/day
上限： No established UL
研究中使用的剂量
| 剂量 | 持续时间 | 效果 | N |
|---|---|---|---|
| None | -- | Neutral | 113 |
| None | -- | Neutral | 2851 |
| None | -- | Mixed | 108 |
| not applicable | -- | Mixed | 180 |
| None | -- | Positive | 973 |
| not applicable | -- | Mixed | 467 |
| standard replacement doses | -- | Neutral | 3028 |
| None | -- | Neutral | 100 |
最佳服用时间： With meals; sublingual form can be taken any time
Safety & Side Effects
已报告的副作用
- ⚠ Generally well tolerated even at high doses
- ⚠ Rare allergic reactions (itching, swelling)
- ⚠ Mild diarrhea or nausea at very high doses
已知相互作用
- ● Metformin (reduces B12 absorption by 10-30%)
- ● Proton pump inhibitors and H2 blockers (reduce B12 absorption)
- ● Colchicine (may reduce B12 absorption)
可耐受最高摄入量： No established UL
在开始服用任何补充剂之前，请务必咨询您的医疗保健提供者。
Frequently Asked Questions
Does 维生素 B12 help with 休止期脱发?
Based on 13 studies with 8,121 participants, there is insufficient evidence at this time that 维生素 B12 may support 休止期脱发 management. Our evidence grade is F (Evidence Against).
How much 维生素 B12 should I take for 休止期脱发?
Studies have used various dosages. A commonly studied range is 2.4 mcg/day. Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of 维生素 B12?
Reported side effects may include Generally well tolerated even at high doses, Rare allergic reactions (itching, swelling), Mild diarrhea or nausea at very high doses. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for 维生素 B12 and 休止期脱发?
We rate the evidence as Grade F (Evidence Against). This rating is based on 13 peer-reviewed studies with 8,121 total participants. The overall direction of effect is mixed.
Related Evidence
其他成分用于 休止期脱发
维生素 B12 用于其他健康状况
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