Vitamin B12 для Post-Bariatric Nutritional Support

Q: Does Vitamin B12 help with Post-Bariatric Nutritional Support?

Based on 10 studies with 1,000 participants, there is moderate evidence from clinical studies that Vitamin B12 may support Post-Bariatric Nutritional Support management. Our evidence grade is B (Good Evidence).

Q: How much Vitamin B12 should I take for Post-Bariatric Nutritional Support?

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.

Q: 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.

Q: How strong is the evidence for Vitamin B12 and Post-Bariatric Nutritional Support?

We rate the evidence as Grade B (Good Evidence). This rating is based on 10 peer-reviewed studies with 1,000 total participants. The overall direction of effect is positive.

B Доказательства По меньшей мере одно рандомизированное исследование подтверждает это, с в целом согласованными результатами.

B12 deficiency occurs in 19-35% of post-bariatric patients due to reduced intrinsic factor and acid secretion. ASMBS guidelines mandate lifelong B12 supplementation (at least 1,000 mcg/day sublingual or 1,000 mcg/month IM). Deficiency causes neuropathy and anemia.

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Итог

Key Study Findings

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 или: Laparoscopic Roux-en-Y gastric bypass (LRYGB) Outcome: Nutritional deficiency prevalence at 10 years Эффект: Iron deficiency: LSG 14% vs LRYGB 41% p=0.017 (iron deficiency)

Популяция: Severely obese adults undergoing bariatric surgery

Systematic Review

Preoperative Micronutrient Repletion Strategies in Metabolic and Bariatric Surgery: A Systematic Review.

Dose: Various (oral supplements, megadoses, injections) или: Usual care or no treatment Outcome: Micronutrient status pre/post-surgery Эффект: None None

Популяция: Metabolic and bariatric surgery candidates

Review

Risks and limits of bariatric surgery: old solutions and a new potential option.

Dose: None или: Placebo Эффект: None None

Other n=53 24 weeks

Vitamin B12 supplementation orally and intramuscularly in people with obesity undergoing gastric bypass.

Dose: None или: control Outcome: preoperatively and postoperatively at 1, 2, 3, and … Эффект: or 6 p<0.001

Популяция: people with obesity undergoing gastric bypass

Randomized Controlled Trial n=76 48 weeks Open-label

Optimizing Multivitamin Supplementation for Sleeve Gastrectomy Patients.

Dose: 2.0 g или: control Outcome: None Эффект: or 12 None

Популяция: None

Review

Vitamin B12 Deficiency: Recognition and Management.

Dose: None или: None Outcome: None Эффект: None None

Популяция: Patients with vitamin B12 deficiency

Key Statistics

Исследования

1000

Участники

↑

Positive

Оценка

Referenced Papers

Nutritional deficiencies after sleeve gastrectomy and Roux-en-Y gastric bypass at 10 years: secondary analysis of the SLEEVEPASS randomized clinical trial. RCT

The British journal … 2025 10 цитирований

Preoperative Micronutrient Repletion Strategies in Metabolic and Bariatric Surgery: A Systematic Review. Systematic Review

Journal of the … 2025 6 цитирований

Risks and limits of bariatric surgery: old solutions and a new potential option. Review

European review for … 2023 5 цитирований

Optimizing Multivitamin Supplementation for Sleeve Gastrectomy Patients. Other

Obesity surgery 2021 13 цитирований

Vitamin B12 supplementation orally and intramuscularly in people with obesity undergoing gastric bypass. Other

Obesity research & … 2021 2 цитирований

Vitamin B12 Deficiency: Recognition and Management. Other

American family physician 2017 282 цитирований

Nutritional management of patients after bariatric surgery. Review

The American journal … 2006 143 цитирований

Dosage & Usage

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

Часто используемые дозировки

vegans:: 250-1,000 mcg/day
general:: 2.4 mcg/day (RDA)
metforminusers:: 1,000 mcg/day
supplementation:: 500-1,000 mcg/day methylcobalamin

Верхний предел: No established UL (water-soluble, excess excreted)

Дозировки, изученные в исследованиях

Дозировка	Длительность	Эффект	N
None	520 weeks	Positive	240
Various (oral supplements, megadoses, injections)	--	Mixed	--
None	--	Mixed	--
None	24 weeks	Mixed	53
2.0 g	48 weeks	Positive	76
None	--	Mixed	--
None	--	Positive	--

Лучшее время приёма: Morning (may provide energy boost); sublingual for better absorption; separate from vitamin C (

Safety & Side Effects

Зарегистрированные побочные эффекты

⚠ Acne (rare, at high doses)
⚠ Diarrhea (rare)
⚠ Generally very well tolerated

Известные взаимодействия

● Metformin (depletes B12 — monitor levels)
● Proton pump inhibitors (reduced absorption)
● H2 receptor antagonists (reduced absorption)
● Colchicine (reduced absorption)

Допустимый верхний уровень потребления: No established UL (water-soluble, excess excreted)

Всегда консультируйтесь с врачом перед началом приёма любых добавок.Всегда консультируйтесь с лечащим врачом перед началом приёма любой добавки.

Frequently Asked Questions

Does Vitamin B12 help with Post-Bariatric Nutritional Support?

Based on 10 studies with 1,000 participants, there is moderate evidence from clinical studies that Vitamin B12 may support Post-Bariatric Nutritional Support management. Our evidence grade is B (Good Evidence).

How much Vitamin B12 should I take for Post-Bariatric Nutritional Support?

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 Post-Bariatric Nutritional Support?

We rate the evidence as Grade B (Good Evidence). This rating is based on 10 peer-reviewed studies with 1,000 total participants. The overall direction of effect is positive.

Другие ингредиенты для Post-Bariatric Nutritional Support

Iron B Whey Protein B

Vitamin B12 для других состояний

Slow Metabolism C

Краткий вывод

Evidence Strength72%

High confidence

Разбор исследований

RCT (1)Meta (0)Other (9)

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Узнайте, как другие ингредиенты сравниваются при данном состоянии.

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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] Xueying Tang et al.. J Acad Nutr Diet. 2025. Preoperative Micronutrient Repletion Strategies in Metabolic and Bariatric Surgery: A Systematic Review. doi:10.1016/j.jand.2024.09.007 PubMed
[3] 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
[4] Laura Heusschen et al.. Obes Surg. 2021. Optimizing Multivitamin Supplementation for Sleeve Gastrectomy Patients. doi:10.1007/s11695-021-05282-4 PubMed
[5] 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
[6] Robert C Langan et al.. Am Fam Physician. 2017. Vitamin B12 Deficiency: Recognition and Management. PubMed
[7] Emmy Parkes. Am J Med Sci. 2006. Nutritional management of patients after bariatric surgery. doi:10.1097/00000441-200604000-00007 PubMed

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