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Vitamina B12 para Perda Capilar por Deficiência Nutricional

F

Baseado em 20 estudos com 8,355 participantes no total. Os resultados são variados entre os estudos.

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F

Conclusão

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 Efeito: None None
Retrospective cohort n=2851
Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience.
Dose: None vs: Placebo Efeito: 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 Efeito: None None

População: Review of pharmacogenomics of THC and CBD

Key Statistics

19

Estudos

8130

Participantes

Mixed

F

Nota

Referenced Papers

Frontiers in pharmacology 2022 31 citações
Journal of pain … 2020 56 citações
American journal of … 2017 104 citações
Acta dermatovenerologica Croatica … 2016 6 citações
Prostaglandins, leukotrienes, and … 2015 40 citações
Dermatologic clinics 1993 38 citações

Dosage & Usage

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

Dosagens Comumente Utilizadas

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

Limite superior: No established UL

Dosagens Estudadas em Pesquisas

Dosagem Duração Efeito 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

Melhor horário: With meals; sublingual form can be taken any time

Safety & Side Effects

Efeitos Colaterais Relatados

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

Interações Conhecidas

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

Ingestão máxima tolerável: No established UL

Consulte sempre o seu profissional de saúde antes de iniciar qualquer suplemento.Sempre consulte seu profissional de saúde antes de iniciar qualquer suplemento.

Frequently Asked Questions

Does Vitamina B12 help with Perda Capilar por Deficiência Nutricional?
Based on 19 studies with 8,130 participants, there is insufficient evidence at this time that Vitamina B12 may support Perda Capilar por Deficiência Nutricional management. Our evidence grade is F (Evidence Against).
How much Vitamina B12 should I take for Perda Capilar por Deficiência Nutricional?
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 Perda Capilar por Deficiência Nutricional?
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

Outros ingredientes para Perda Capilar por Deficiência Nutricional

Vitamina B12 para outras condições

Aviso Legal da FDA: Estas declarações não foram avaliadas pela Food and Drug Administration. Os produtos e informações neste site não se destinam a diagnosticar, tratar, curar ou prevenir qualquer doença. As notas de evidência apresentadas são baseadas em nossa análise de pesquisas revisadas por pares publicadas e não constituem aconselhamento médico. Sempre consulte seu profissional de saúde antes de iniciar qualquer regime de suplementação.