The Hidden Epidemic: Why B12 Deficiency Is Robbing You of Energy and Raising Your Cancer Risk

According to a 2025 review published in American Family Physician (the official journal of the American Academy of Family Physicians), vitamin B12 deficiency occurs in approximately 2% to 3% of adults in the United States. However, as we age, the risk of B12 deficiency increases. According to a 2024 editorial in The BMJ (formerly the British Medical Journal), the incidence of vitamin B12 deficiency is approximately 20% in adults over 60.

That’s a staggering statistic, especially considering the United States is a country of meat-eaters. So why are so many of us deficient—and why does it matter more than you’ve been told? The answer lies in understanding not just what B12 does, but how your body absorbs it, and what happens when that process breaks down.

What B12 Does in Your Body

B12, also known as cobalamin, is far more than just an “energy vitamin”—though that alone would be reason enough to pay attention. It plays essential roles in:

• Formation of myelin, the protective sheath that helps nerve cells communicate – Vitamin B12 (cobalamin) is essential for myelin synthesis, and deficiency leads to demyelinating neurological disorders, including subacute combined degeneration of the spinal cord and peripheral neuropathy.
• Digestion, food absorption, and metabolism of both fats and carbohydrates – Vitamin B12 absorption is a complex process requiring intrinsic factor for uptake in the ileum. Once absorbed, B12 functions as a coenzyme in methylmalonyl-CoA mutase, an enzyme critical for the metabolism of odd-chain fatty acids and the amino acids valine, isoleucine, and threonine.
• Iron absorption and red blood cell formation – Vitamin B12, along with iron and folate, is essential for normal red blood cell production (erythropoiesis). A deficiency in any of these can lead to anemia.
• Nervous system function, brain health, and adrenal hormone production – B vitamins, including B12, play crucial roles as coenzymes in the nervous system, supporting cellular energy production, antioxidant defense, and neurotransmitter synthesis. Vitamin B12 deficiency causes neurological dysfunction, cognitive decline, and mood disorders, particularly in older adults.
• Immune system function and reproductive health – Among reproductive-age women, vitamin B12 deficiency is directly correlated with proinflammatory markers, including hs-CRP, TNF-α, and IL-6. B12 also positively affects semen quality by increasing sperm count, enhancing motility, and reducing sperm DNA damage.

Perhaps most critically, B12 is essential for DNA synthesis. Without adequate B12 and folate, DNA can eventually break down to the point where mutations—and cancer—can occur.

The Cancer Link You Need to Know

The connection between B12 deficiency and cancer is not theoretical—it’s been documented in multiple studies. A 2021 review found that B12 deficiency leads to increased uracil misincorporation into DNA, causing impaired DNA synthesis and genomic instability—both critical factors in cancer development.

The relationship between B12 and colorectal cancer has been particularly well-studied. Dietary nutrients involved in one-carbon metabolism—including vitamin B12—play a significant role in modulating colorectal cancer risk through their effects on DNA synthesis, methylation pathways, and redox homeostasis.

B12 deficiency has also been connected to breast cancer risk. Given B12’s role in DNA synthesis and methylation, this makes perfect sense. When your body lacks the tools to keep DNA healthy and genes properly regulated, the conditions for cellular mutation become far more favorable.

Recognizing the Signs of Deficiency

Because B12 deficiency can develop slowly over years, many people chalk up the symptoms to “getting older” or “being busy.” But deficiency symptoms should be on your radar if you experience:

• “Brain fog,” memory issues, lack of motivation, or prolonged apathy
• Mood swings and grouchiness
• Fatigue or low energy that doesn’t improve with rest
• Tingling in the extremities (hands and feet)
• Muscle weakness
• In extreme cases: depression, dementia, blindness, or neurological damage

The ‘Intrinsic Factor’ Factor

Here’s something most people don’t know: B12 is a large molecule that requires a “binding agent” to be absorbed into your system.

That binding agent is called Intrinsic Factor, and it’s produced in the lining of your stomach. Intrinsic Factor binds with B12 and helps move it through the small intestine for absorption. It is not known to have any other function than facilitating the transmucosal transfer of vitamin B12.

Many individuals with digestive imbalances have lower-than-normal production of Intrinsic Factor. In fact, Pernicious Anemia—an autoimmune condition that develops through a lack of Intrinsic Factor production—is a leading cause of vitamin B12 deficiency.

If your body isn’t producing enough Intrinsic Factor, you can consume all the B12 in the world, and your body simply won’t absorb it.

What You Can Do

The first step is recognizing that B12 deficiency is both common and consequential. It’s not a minor issue—it’s a potentially dangerous health condition that can raise your risk of cancer and lead to neurological damage, anemia, and heart complications.

If you suspect you may be deficient, here are practical steps to consider:

1. Choose the right form of B12. Not all B12 is created equal. Three natural, bioidentical forms of B12 are commercially available: methylcobalamin (MeCbl), adenosylcobalamin (AdCbl), and hydroxycobalamin (OHCbl). These are preferred over cyanocobalamin (CNCbl)—a synthetic form used in many inexpensive supplements—due to their superior bioavailability and safety.
2. Focus on gut health. Since absorption issues are at the root of most B12 deficiencies, nurturing your digestive system is essential. Addressing conditions like chronic gastritis, pancreatic insufficiency, or small intestinal bacterial overgrowth can significantly improve your ability to absorb B12 from food and supplements.
3. Consider supplementation. But it needs to be the right kind of B12! Here’s the thing most people don’t realize: you can take B12 every single day and still be deficient. Why? Because absorption is everything. Regular B12 supplements—especially the cheap synthetic kind—often don’t survive the journey through your digestive system. They get broken down by stomach acid, never reach your bloodstream, and end up flushed out of your body without ever doing you any good.

That’s why not all supplements are created equal.

The Liposomal Difference

Liposomes are microscopic, fat-based spheres that act like tiny delivery vehicles for nutrients. Because they’re made from the same materials as your cell membranes, they’re able to slip past your digestive defenses and deliver their cargo directly into your bloodstream.

Think of it this way: liposomes are protected during digestion and get absorbed into your blood faster—much faster than standard capsules or tablets.

But there’s an even better approach: micelle liposomal delivery.

This is a two-layer system. First, the B12 is wrapped in micelles—tiny molecular clusters that shield it from harsh stomach acid. Then, those micelles are encapsulated in liposomes, which are fat-based membranes that mimic your own cells and glide effortlessly through your intestinal wall.

This dual-encapsulation ensures the formula passes safely through digestion and delivers a nearly 100% absorbable dose of B12 directly into your bloodstream—so your body can actually use it, even if your intrinsic factor levels have plummeted.

What B12 Do We Take Daily?

Here at the Bollinger household, we love Purality Health’s Micelle Liposomal B12—because it combines bioactive methylcobalamin—the high-quality, ready-to-use form of B12—with fulvic acid, a natural compound that acts like a nutrient supercharger, shuttling vitamins directly into your cells for faster, deeper absorption.

Fulvic acid enhances how well your body uses B12, even if you have trouble absorbing it through food or standard supplements.

Together, this advanced blend supports:

• Clear thinking
• Balanced mood
• Steady energy
• Long-term brain health

It helps you feel sharper, brighter, and more alive every day.

Give it a try!