Vitamin B12 per Slow Metabolism
C Evidenze Evidenza limitata da studi di piccole dimensioni, ma esistono alcuni segnali positivi.B12 deficiency impairs mitochondrial fatty acid oxidation. Observational study (n=9,075) found deficiency associated with higher BMI (OR 1.32). Metformin depletes B12 in 10-30% of users. Correction restores energy levels and exercise capacity.
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C
In sintesi
B12 deficiency impairs mitochondrial fatty acid oxidation. Observational study (n=9,075) found deficiency associated with higher BMI (OR 1.32). Metformin depletes B12 in 10-30% of users. Correction restores energy levels and exercise capacity.
Key Study Findings
Controlled Clinical Trial
32 weeks
Vitamin B12 supplementation attenuates endoplasmic reticulum stress and neuronal cell death in the cerebral cortex …
Dose: 50 ug/kg diet vs 25 ug/kg diet
vs: HFHS diet without extra B12
Outcome: ER stress and neuronal cell death in cerebral …
Effetto: None
None
Popolazione: Male C57BL/6J mice on high-fat high-sucrose diet
Review
Analytical Review on Nutritional Deficiencies in Vegan Diets: Risks, Prevention, and Optimal Strategies.
Dose: None
vs: None
Outcome: None
Effetto: None
None
Popolazione: None
Review
Vitamin B12: prevention of human beings from lethal diseases and its food application.
Dose: None
vs: None
Outcome: None
Effetto: None
None
Popolazione: None
Randomized Controlled Trial
n=240
520 weeks
Open-label
Nutritional deficiencies after sleeve gastrectomy and Roux-en-Y gastric bypass at 10 years: secondary analysis of …
Dose: None
vs: Laparoscopic Roux-en-Y gastric bypass (LRYGB)
Outcome: Nutritional deficiency prevalence at 10 years
Effetto: Iron deficiency: LSG 14% vs LRYGB 41%
p=0.017 (iron deficiency)
Popolazione: Severely obese adults undergoing bariatric surgery
Observational Study
n=155
Intake of fiber and micronutrients in patients with IBS.
Dose: None
vs: None
Outcome: Fiber and micronutrient intake in IBS patients
Effetto: 91% low fiber; 85.8% low vitamin D
None
Popolazione: IBS patients (Rome IV), 83.9% women, median 42 years
Review
Nutrition Challenges and Opportunities When Shifting to Plant-Based Diets.
Dose: Plant-based/vegetarian/vegan diets
vs: None
Outcome: Nutritional adequacy and health outcomes
Effetto: None
None
Popolazione: People shifting to plant-based diets
Key Statistics
5
Studi
9000
Partecipanti
↑
Positive
C
Grado
Referenced Papers
The British journal …
2025
10 citazioni
Journal of the …
2025
9 citazioni
Journal of the …
2025
7 citazioni
Nutrition (Burbank, Los …
2025
Scandinavian journal of …
2025
A systematic review on the impact of nutrition and possible supplementation on the deficiency of vitamin complexes, iron, omega-3-fatty acids, …
Systematic Review
Archives of gynecology …
2024
18 citazioni
BMC gastroenterology
2024
8 citazioni
Lifestyle genomics
2024
5 citazioni
Nestle Nutrition Institute …
2024
European review for …
2023
5 citazioni
[Not Available].
Review
Ugeskrift for laeger
2023
International journal of …
2022
102 citazioni
Retrospective evaluation of clinical profile and comorbidities in patients with alopecia areata.
Other
Northern clinics of …
2022
7 citazioni
Nutrients
2021
113 citazioni
Obesity surgery
2021
13 citazioni
Obesity research & …
2021
2 citazioni
Nutrients
2018
30 citazioni
The American journal …
2018
17 citazioni
Medycyna wieku rozwojowego
2011
The American journal …
2006
143 citazioni
The British journal …
2000
44 citazioni
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Dosaggi di uso comune
- vegans:
- 250-1,000 mcg/day
- general:
- 2.4 mcg/day (RDA)
- metforminusers:
- 1,000 mcg/day
- supplementation:
- 500-1,000 mcg/day methylcobalamin
Limite massimo: No established UL (water-soluble, excess excreted)
Dosaggi studiati nella ricerca
| Dosaggio | Durata | Effetto | N |
|---|---|---|---|
| 50 ug/kg diet vs 25 ug/kg diet | 32 weeks | Positive | -- |
| None | -- | Mixed | -- |
| None | -- | Mixed | -- |
| None | 520 weeks | Positive | 240 |
| None | -- | Negative | 155 |
| Plant-based/vegetarian/vegan diets | -- | Mixed | -- |
| None | -- | Neutral | -- |
| None | -- | Negative | 90 |
Momento migliore per l'assunzione: Morning (may provide energy boost); sublingual for better absorption; separate from vitamin C (
Safety & Side Effects
Effetti collaterali segnalati
- ⚠ Acne (rare, at high doses)
- ⚠ Diarrhea (rare)
- ⚠ Generally very well tolerated
Interazioni note
- ● Metformin (depletes B12 — monitor levels)
- ● Proton pump inhibitors (reduced absorption)
- ● H2 receptor antagonists (reduced absorption)
- ● Colchicine (reduced absorption)
Livello di assunzione massimo tollerabile: No established UL (water-soluble, excess excreted)
Consultare sempre il proprio medico prima di iniziare qualsiasi integratore.Consultate sempre il vostro medico prima di iniziare qualsiasi integratore.
Frequently Asked Questions
Does Vitamin B12 help with Slow Metabolism?
Based on 5 studies with 9,000 participants, there is limited but promising evidence that Vitamin B12 may support Slow Metabolism management. Our evidence grade is C (Some Evidence).
How much Vitamin B12 should I take for Slow Metabolism?
Studies have used various dosages. A commonly studied range is 250-1,000 mcg/day. Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of Vitamin B12?
Reported side effects may include Acne (rare, at high doses), Diarrhea (rare), Generally very well tolerated. 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 Slow Metabolism?
We rate the evidence as Grade C (Some Evidence). This rating is based on 5 peer-reviewed studies with 9,000 total participants. The overall direction of effect is positive.
Related Evidence
Altri ingredienti per Slow Metabolism
Vitamin B12 per altre condizioni
References
- [1] Ilmari Saarinen et al.. Br J Surg. 2025. Nutritional deficiencies after sleeve gastrectomy and Roux-en-Y gastric bypass at 10 years: secondary analysis of the SLEEVEPASS randomized clinical trial. doi:10.1093/bjs/znaf132 PubMed
- [2] S Harikrishnan et al.. J Sci Food Agric. 2025. Vitamin B12: prevention of human beings from lethal diseases and its food application. doi:10.1002/jsfa.13661 PubMed
- [3] Anshika Malhotra et al.. J Am Nutr Assoc. 2025. Analytical Review on Nutritional Deficiencies in Vegan Diets: Risks, Prevention, and Optimal Strategies. doi:10.1080/27697061.2025.2461218 PubMed
- [4] Udaykanth Suryavanshi et al.. Nutrition. 2025. Vitamin B12 supplementation attenuates endoplasmic reticulum stress and neuronal cell death in the cerebral cortex of high-fat high-sucrose-fed male mice. doi:10.1016/j.nut.2025.112808 PubMed
- [5] Bodil Roth et al.. Scand J Gastroenterol. 2025. Intake of fiber and micronutrients in patients with IBS. doi:10.1080/00365521.2025.2535721 PubMed
- [6] Friederike Wylenzek et al.. Arch Gynecol Obstet. 2024. A systematic review on the impact of nutrition and possible supplementation on the deficiency of vitamin complexes, iron, omega-3-fatty acids, … doi:10.1007/s00404-024-07555-6 PubMed
- [7] Bodil Roth et al.. BMC Gastroenterol. 2024. Overweight and vitamin D deficiency are common in patients with irritable bowel syndrome - a cross-sectional study. doi:10.1186/s12876-024-03373-x PubMed
- [8] Carolina F Nicoletti et al.. Lifestyle Genom. 2024. DNA Methylation and Non-Coding RNAs in Metabolic Disorders: Epigenetic Role of Nutrients, Dietary Patterns, and Weight Loss Interventions for Precision … doi:10.1159/000541000 PubMed
- [9] Paula Hallam. Nestle Nutr Inst Workshop Ser. 2024. Nutrition Challenges and Opportunities When Shifting to Plant-Based Diets. doi:10.1159/000540147 PubMed
- [10] R Gambioli et al.. Eur Rev Med Pharmacol Sci. 2023. Risks and limits of bariatric surgery: old solutions and a new potential option. doi:10.26355/eurrev_202306_32822 PubMed
- [11] Charlotte Näslund-Koch et al.. Ugeskr Laeger. 2023. [Not Available]. PubMed
- [12] Aniceta A Mikulska et al.. Int J Mol Sci. 2022. Metabolic Characteristics of Hashimoto's Thyroiditis Patients and the Role of Microelements and Diet in the Disease Management-An Overview. doi:10.3390/ijms23126580 PubMed
- [13] Sule Goksin. North Clin Istanb. 2022. Retrospective evaluation of clinical profile and comorbidities in patients with alopecia areata. doi:10.14744/nci.2022.78790 PubMed
- [14] Giulia Marrone et al.. Nutrients. 2021. Vegan Diet Health Benefits in Metabolic Syndrome. doi:10.3390/nu13030817 PubMed
- [15] Laura Heusschen et al.. Obes Surg. 2021. Optimizing Multivitamin Supplementation for Sleeve Gastrectomy Patients. doi:10.1007/s11695-021-05282-4 PubMed
- [16] Rafael Jacques Ramos et al.. Obes Res Clin Pract. 2021. Vitamin B12 supplementation orally and intramuscularly in people with obesity undergoing gastric bypass. doi:10.1016/j.orcp.2021.02.002 PubMed
- [17] Antoine Brangier et al.. Nutrients. 2018. Vitamin K Antagonists and Cognitive Decline in Older Adults: A 24-Month Follow-Up. doi:10.3390/nu10060666 PubMed
- [18] Pol Solé-Navais et al.. Am J Clin Nutr. 2018. Early pregnancy folate-cobalamin interactions and their effects on cobalamin status and hematologic variables throughout pregnancy. doi:10.1093/ajcn/nqx041 PubMed
- [19] Dorota Szostak-Węgierek. Med Wieku Rozwoj. 2011. [Nutrition and fertility]. PubMed
- [20] Emmy Parkes. Am J Med Sci. 2006. Nutritional management of patients after bariatric surgery. doi:10.1097/00000441-200604000-00007 PubMed
- [21] S E Gariballa. Br J Nutr. 2000. Nutritional factors in stroke. doi:10.1017/s0007114500001173 PubMed
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