Vitamin B12 cho Rụng Tóc Do Thiếu Dinh Dưỡng

Q: Does Vitamin B12 help with Rụng Tóc Do Thiếu Dinh Dưỡng?

Based on 19 studies with 8,130 participants, there is insufficient evidence at this time that Vitamin B12 may support Rụng Tóc Do Thiếu Dinh Dưỡng management. Our evidence grade is F (Evidence Against).

Q: How much Vitamin B12 should I take for Rụng Tóc Do Thiếu Dinh Dưỡng?

Studies have used various dosages. A commonly studied range is 2.4 mcg/day. Always consult your healthcare provider before starting any supplement regimen.

Q: Are there side effects of Vitamin 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.

Q: How strong is the evidence for Vitamin B12 and Rụng Tóc Do Thiếu Dinh Dưỡng?

We rate the evidence as Grade F (Evidence Against). This rating is based on 19 peer-reviewed studies with 8,130 total participants. The overall direction of effect is mixed.

Dựa trên 20 nghiên cứu với 8,355 người tham gia. Kết quả nghiên cứu không đồng nhất.

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Kết luận

Research shows mixed results for vitamin B12 and hair loss — while deficiency may contribute to hair thinning, supplementation is unlikely to help unless you have a confirmed B12 deficiency.

Mixed results across 20 studies — no consistent benefit from supplementation
Some studies find lower B12 levels in hair loss patients, others do not
No large-scale RCTs testing B12 supplementation specifically for hair regrowth
Supplementation may only help if a genuine B12 deficiency is present

Key Study Findings

retrospective observational n=113

Telogen Effluvium Following Coronavirus Disease-2019 Infection: A Retrospective Study of 113 Cases.

Dose: None so với: Placebo Hiệu quả: None None

Retrospective cohort n=2851

Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience.

Dose: None so với: Placebo Hiệu quả: Ferritin low in 46.5% of patients; iron deficiency in 29.5% p<0.05

Review

Medical Marijuana and Treatment Personalization: The Role of Genetics and Epigenetics in Response to THC …

Dose: None so với: None Outcome: None Hiệu quả: None None

Đối tượng nghiên cứu: Review of pharmacogenomics of THC and CBD

case-control study n=180

A comprehensive investigation of biochemical status in patients with telogen effluvium: Analysis of Hb, ferritin, …

Dose: not applicable so với: Placebo Hiệu quả: None None

Cross-Sectional Study n=108

Evaluation of the relationship of digital phototrichogram findings of patients with diffuse hair loss with …

Dose: None so với: Placebo Hiệu quả: None 0.05

Case-control n=973

Micronutrient Deficiencies and Digital Computerized Phototrichogram Analysis in Telogen Effluvium: a Retrospective Correlation Study in …

Dose: None so với: Placebo Hiệu quả: r=0.417 (HGB and AHR in females) p=0.008

Key Statistics

Nghiên cứu

8130

Người tham gia

↔

Mixed

Xếp hạng

Referenced Papers

Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience. Other

Journal of cosmetic … 2025 4 trích dẫn

Medical Marijuana and Treatment Personalization: The Role of Genetics and Epigenetics in Response to THC and CBD. Review

Genes 2025 1 trích dẫn

Telogen Effluvium Following Coronavirus Disease-2019 Infection: A Retrospective Study of 113 Cases. Other

International journal of … 2025

A comprehensive investigation of biochemical status in patients with telogen effluvium: Analysis of Hb, ferritin, vitamin B12, vitamin D, thyroid … Other

Journal of cosmetic … 2024 7 trích dẫn

Evaluation of the relationship of digital phototrichogram findings of patients with diffuse hair loss with blood TSH, ferritin and vitamin … Other

Northern clinics of … 2024 1 trích dẫn

Quantity of Melatonin and CBD in Melatonin Gummies Sold in the US. Other

JAMA 2023 49 trích dẫn

Micronutrient Deficiencies and Digital Computerized Phototrichogram Analysis in Telogen Effluvium: a Retrospective Correlation Study in a Tertiary Medical Center. Other

Dermatology practical & … 2023 4 trích dẫn

Effects of Cannabidiol on Exercise Physiology and Bioenergetics: A Randomised Controlled Pilot Trial. Other

Sports medicine - … 2022 34 trích dẫn

Differentiating Cannabis Products: Drugs, Food, and Supplements. Review

Frontiers in pharmacology 2022 31 trích dẫn

Telogen effluvium in daily practice: Patient characteristics, laboratory parameters, and treatment modalities of 3028 patients with telogen effluvium. Other

Journal of cosmetic … 2022 22 trích dẫn

Nonscarring scalp alopecia: Which laboratory analysis should we perform on whom? Other

Turkish journal of … 2022 8 trích dẫn

CBD Effects on TRPV1 Signaling Pathways in Cultured DRG Neurons. Other

Journal of pain … 2020 56 trích dẫn

NonScarring Diffuse Hair Loss in Women: a Clinico-Etiological Study from tertiary care center in North-West India. Observational

Journal of cosmetic … 2019 25 trích dẫn

The Role of Micronutrients in Alopecia Areata: A Review. Review

American journal of … 2017 104 trích dẫn

Vitamin and Mineral Deficiencies in Patients With Telogen Effluvium: A Retrospective Cross-Sectional Study. Other

Journal of drugs … 2016 56 trích dẫn

Clinicoepidemiological Observational Study of Acquired Alopecias in Females Correlating with Anemia and Thyroid Function. Other

Dermatology research and … 2016 26 trích dẫn

Trichotillomania: Bizzare Patern of Hair Loss at 11-Year-old Girl. Case Report

Acta dermatovenerologica Croatica … 2016 6 trích dẫn

Vitamin B12 and omega-3 fatty acids together regulate lipid metabolism in Wistar rats. Other

Prostaglandins, leukotrienes, and … 2015 40 trích dẫn

The role of psychological factors and serum zinc, folate and vitamin B12 levels in the aetiology of trichodynia: a case-control … Other

Clinical and experimental … 2009 34 trích dẫn

Management of hair loss in women. Review

Dermatologic clinics 1993 38 trích dẫn

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Liều lượng thường dùng

general:: 2.4 mcg/day
deficiency:: 1,000-2,000 mcg/day

Giới hạn trên: No established UL

Liều lượng đã nghiên cứu

Liều lượng	Thời gian	Hiệu quả	N
None	--	Neutral	113
None	--	Neutral	2851
None	--	Mixed	--
not applicable	--	Mixed	180
None	--	Mixed	108
None	--	Positive	973
None	--	Neutral	--
300 mg single dose	--	Mixed	9

Thời điểm dùng tốt nhất: With meals; sublingual form can be taken any time

Safety & Side Effects

Tác dụng phụ đã được báo cáo

⚠ Generally well tolerated even at high doses
⚠ Rare allergic reactions (itching, swelling)
⚠ Mild diarrhea or nausea at very high doses

Tương tác đã biết

● Metformin (reduces B12 absorption by 10-30%)
● Proton pump inhibitors and H2 blockers (reduce B12 absorption)
● Colchicine (may reduce B12 absorption)

Mức hấp thụ tối đa cho phép: No established UL

Luôn tham khảo ý kiến bác sĩ trước khi bắt đầu sử dụng bất kỳ thực phẩm bổ sung nào.Luôn tham khảo ý kiến chuyên gia y tế trước khi sử dụng bất kỳ thực phẩm chức năng nào.

Frequently Asked Questions

Does Vitamin B12 help with Rụng Tóc Do Thiếu Dinh Dưỡng?

Based on 19 studies with 8,130 participants, there is insufficient evidence at this time that Vitamin B12 may support Rụng Tóc Do Thiếu Dinh Dưỡng management. Our evidence grade is F (Evidence Against).

How much Vitamin B12 should I take for Rụng Tóc Do Thiếu Dinh Dưỡng?

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 Vitamin 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 Vitamin B12 and Rụng Tóc Do Thiếu Dinh Dưỡng?

We rate the evidence as Grade F (Evidence Against). This rating is based on 19 peer-reviewed studies with 8,130 total participants. The overall direction of effect is mixed.

Related Evidence

Các thành phần khác cho Rụng Tóc Do Thiếu Dinh Dưỡng

Selenium A Biotin B Vitamin A D L-Cysteine D Folate F

Vitamin B12 cho các tình trạng khác

Telogen Effluvium F

Đánh giá nhanh

Dựa trên 20 nghiên cứu với 8,355 người tham gia. Kết quả nghiên cứu không đồng nhất.

Evidence Strength10%

Low confidence

Phân tích nghiên cứu

RCT (0)Meta (0)Other (19)

So sánh lựa chọn thay thế

Xem các thành phần khác so sánh như thế nào cho tình trạng này.

Xem tất cả thành phần cho Rụng Tóc Do Thiếu Dinh Dưỡng

Tìm hiểu thêm

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