Vitamin B12

Dr. Andrew Huberman Mentions in Context of Mental Health

Huberman's coverage of B12 is limited and indirect. His most relevant mention comes in a guest episode with Dr. Chris Palmer on metabolic psychiatry, where B12 is discussed alongside folate and iron as critical vitamins for mitochondrial function with direct impact on mental health. Dr. Palmer highlights that deficiencies in these nutrients, particularly in certain populations, are linked to neurological and psychiatric symptoms. B12 is not part of Huberman's frequently discussed foundational supplement stack.

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Dr. Peter Attia Includes in Personal Protocol

Attia includes B12 (methylcobalamin) in his personal supplement protocol, paired with methylfolate, specifically targeting homocysteine levels below nine as a cardiovascular risk biomarker. His approach is characteristically data-driven — he supplements based on blood markers, not general recommendations. In his Alzheimer's prevention episodes with Dr. Richard Isaacson, B12 deficiency is flagged as a reversible cause of cognitive decline that should be ruled out during clinical assessment. He also notes B12 deficiency as a non-genetic factor to consider in hair loss evaluation.

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Dr. Rhonda Patrick Recommends for MTHFR Variants

Patrick covers B12 primarily through the lens of nutrigenomics and genetic polymorphisms. In her video on personalizing nutrition based on genetics, she discusses how MTHFR gene variants affect folate-to-methylfolate conversion and recommends supplementing with both 5-MTHF and methylcobalamin to lower homocysteine levels. She also covers FUT2 gene polymorphisms that specifically impact B12 absorption, necessitating supplemental adjustments. In her interview with Rich Roll, B12 comes up as a key nutritional consideration for plant-based athletes who need to ensure adequate levels through fortified foods or supplementation.

…affecting approximately 46% of the population is in the npf3 Gene and this affects vitamin B6 levels people with this Gene polymorphism have slightly lower vitamin B6 levels and may require that people increase their dietary intake of B6 and or also supplement with vitamin B6 since we're talking about B vitamins and another Gene polymorphism in the fut 2 Gene affects the way vitamin B12 is absorbed in the intestines people with this specific Gene polymorphism need to take a sublingual vitamin B12 to ensure that they're getting enough vitamin B12 let's move on to vitamin A also known as retinol we can convert carotenoids such as betacarotene into provitamin a also…

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Dr. Mark Hyman Strongly Recommends as Essential

Hyman is the most prolific and passionate advocate for B12 supplementation among the five experts, discussing it across more than 25 videos in contexts ranging from brain health and depression to gut health, fertility, and aging. He frames B12 as one of the essential methylating B-vitamins alongside folate and B6, critical for managing homocysteine and preventing cognitive decline. His most striking content features case studies where B12 deficiency was the root cause of psychiatric symptoms — including a patient whose panic attacks resolved immediately after a B12 injection. He consistently warns about populations at risk: vegans, the elderly, those on PPIs, and people with celiac disease. He specifically highlights that elevated methylmalonic acid and homocysteine are more reliable markers than serum B12 and that correcting B12 deficiency can reverse symptoms that mimic dementia. He also extensively covers how PPIs deplete B12 and recommends methylated forms of B-vitamins for supplementation.

…now the long-term side effects are men potentially more significant and those include serious nutritional deficiencies one of the biggest ones is these drugs block the absorption of vitamin B12 vitamin B12 requires stomach acid to be absorbed and if you don't have it you're going to get B12 deficient over the long term that can create depression neurological problems dementia many many things welcome back to another episode of The Doctor's Pharmacy and health bites where we take juicy little bites into current health topics today's topic is acid reflux or heartburn as we used to call it it's a common but uncomfortable condition that affects about 10 to 20% of people in the western…

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What do experts agree on about vitamin b12?

3 of 5 experts actively recommend B12 supplementation, primarily for methylation support and brain health. Attia includes methylcobalamin in his personal protocol specifically to manage homocysteine levels.

Where do the experts disagree on vitamin b12?

Depth of coverage varies dramatically: Hyman treats B12 as a foundational supplement that 'everybody needs' to test for, while Huberman and Johnson barely mention it. This reflects differing clinical vs. biohacking perspectives rather than a scientific disagreement. Attia's approach is strictly biomarker-driven — he supplements B12 only to manage homocysteine as a cardiovascular risk metric, not as a general health recommendation. Hyman takes a broader view, recommending B12 for brain health, energy, mood, and methylation support. Patrick emphasizes the genetic component (MTHFR/FUT2 polymorphisms) as the primary driver for B12 supplementation decisions, while Hyman recommends it more universally as a common deficiency.

How strong is the expert consensus on vitamin b12?

The consensus on vitamin b12 scores 3.6/5 — a strong level of agreement across Huberman, Attia, Patrick, Johnson, and Hyman, based on their public videos.