Vitamina B12 per Perdita di capelli da carenza nutrizionale

Q: Does Vitamina B12 help with Perdita di capelli da carenza nutrizionale?

Based on 19 studies with 8,130 participants, there is insufficient evidence at this time that Vitamina B12 may support Perdita di capelli da carenza nutrizionale management. Our evidence grade is F (Evidence Against).

Q: How much Vitamina B12 should I take for Perdita di capelli da carenza nutrizionale?

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 Vitamina 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 Vitamina B12 and Perdita di capelli da carenza nutrizionale?

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.

Basato su 20 studi con 8,355 partecipanti totali. I risultati sono contrastanti tra gli studi.

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In sintesi

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 vs: Placebo Effetto: None None

Retrospective cohort n=2851

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

Dose: None vs: Placebo Effetto: 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 vs: None Outcome: None Effetto: None None

Popolazione: 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 vs: Placebo Effetto: None None

Cross-Sectional Study n=108

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

Dose: None vs: Placebo Effetto: None 0.05

Case-control n=973

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

Dose: None vs: Placebo Effetto: r=0.417 (HGB and AHR in females) p=0.008

Key Statistics

Studi

8130

Partecipanti

↔

Mixed

Grado

Referenced Papers

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

Journal of cosmetic … 2025 4 citazioni

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

Genes 2025 1 citazioni

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 citazioni

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 citazioni

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

JAMA 2023 49 citazioni

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

Dermatology practical & … 2023 4 citazioni

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

Sports medicine - … 2022 34 citazioni

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

Frontiers in pharmacology 2022 31 citazioni

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

Journal of cosmetic … 2022 22 citazioni

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

Turkish journal of … 2022 8 citazioni

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

Journal of pain … 2020 56 citazioni

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

Journal of cosmetic … 2019 25 citazioni

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

American journal of … 2017 104 citazioni

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

Journal of drugs … 2016 56 citazioni

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

Dermatology research and … 2016 26 citazioni

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

Acta dermatovenerologica Croatica … 2016 6 citazioni

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

Prostaglandins, leukotrienes, and … 2015 40 citazioni

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 citazioni

Management of hair loss in women. Review

Dermatologic clinics 1993 38 citazioni

Dosage & Usage

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

Dosaggi di uso comune

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

Limite massimo: No established UL

Dosaggi studiati nella ricerca

Dosaggio	Durata	Effetto	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

Momento migliore per l'assunzione: With meals; sublingual form can be taken any time

Safety & Side Effects

Effetti collaterali segnalati

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

Interazioni note

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

Livello di assunzione massimo tollerabile: No established UL

Consultare sempre il proprio medico prima di iniziare qualsiasi integratore.Consultate sempre il vostro medico prima di iniziare qualsiasi integratore.

Frequently Asked Questions

Does Vitamina B12 help with Perdita di capelli da carenza nutrizionale?

Based on 19 studies with 8,130 participants, there is insufficient evidence at this time that Vitamina B12 may support Perdita di capelli da carenza nutrizionale management. Our evidence grade is F (Evidence Against).

How much Vitamina B12 should I take for Perdita di capelli da carenza nutrizionale?

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 Vitamina 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 Vitamina B12 and Perdita di capelli da carenza nutrizionale?

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

Altri ingredienti per Perdita di capelli da carenza nutrizionale

Selenio A Biotin B Vitamin A D L-Cisteina D Folato F

Vitamina B12 per altre condizioni

Telogen effluvium F

Verdetto rapido

Basato su 20 studi con 8,355 partecipanti totali. I risultati sono contrastanti tra gli studi.

Evidence Strength10%

Low confidence

Analisi degli studi

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

Confronta le alternative

Scoprite come si confrontano altri ingredienti per questa condizione.

Visualizza tutti gli ingredienti per Perdita di capelli da carenza nutrizionale

Approfondimenti

Avvertenza FDA: Queste affermazioni non sono state valutate dalla Food and Drug Administration. I prodotti e le informazioni presenti su questo sito web non sono destinati a diagnosticare, trattare, curare o prevenire alcuna malattia. I gradi di evidenza presentati si basano sulla nostra analisi della ricerca pubblicata e sottoposta a revisione paritaria e non costituiscono consulenza medica. Consultate sempre il vostro medico prima di iniziare qualsiasi regime di integrazione.