When adults don’t have enough vitamin B12, their body makes fewer new red blood cells. But after getting weekly B12 shots for six weeks, their body starts making many more new red blood cells again, which shows their bone marrow is working better.

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Evidence from Studies

Supporting (1)

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Community contributions welcome

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Clinical and Hematological Characteristics of Vitamin B12 Deficiency and Evaluation of the Therapeutic Response to Vitamin B12 Supplementation

Cohort Study

Human

2024 Dec

The study gave people with low B12 weekly B12 shots and found their bone marrow started making more new red blood cells after six weeks — just like the claim says.

Contradicting (0)

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No contradicting evidence found

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Source Study

Clinical and Hematological Characteristics of Vitamin B12 Deficiency and Evaluation of the Therapeutic Response to Vitamin B12 Supplementation

Score: 43

DOI: 10.7759/cureus.76468

Similar Assertions

If someone has low vitamin B12 and anemia, their red blood cells are unusually large and their blood doesn't carry enough oxygen. Giving them a weekly B12 shot for six weeks can fix this, making their blood cells normal size again and boosting their oxygen levels.

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80%

When people don’t have enough vitamin B12, their blood tends to have less hemoglobin — which means their blood can’t carry oxygen as well. The less B12 they have, the worse their anemia seems to be.

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73%