When patients think about vitamin B12 support, they often focus on how much B12 they are taking, but that is only part of the equation.
For oral vitamin B12 to be used effectively, the body also has to absorb it properly. Proper absorption requires intrinsic factor, a glycoprotein produced by the stomach’s parietal cells that binds with B12 and helps carry it to the distal ileum for absorption. Without enough intrinsic factor, patients may not receive the full benefit of B12.1
Offering patients a supplement that contains both B12 and intrinsic factor, such as Biotrinsic Intrinsic Factor by Dee Cee Laboratories, ensures the body absorbs optimally for the best results possible.
Why absorption of B12 matters so much
The National Institutes of Health (NIH) Office of Dietary Supplements2 notes that vitamin B12 is required for development and function of the central nervous system, healthy red blood cell formation and DNA synthesis. Deficiency can contribute to symptoms such as fatigue, neurologic changes, megaloblastic anemia, tongue inflammation and heart palpitations.
Patients who are deficient in B12 may be eating foods that contain it or even taking a supplement already. If the real problem is impaired B12 absorption, simply adding more B12 may not fully address the issue. Absorption problems can have multiple causes: autoimmunity-driven lack of intrinsic factor, recent gastrointestinal surgery, certain gastrointestinal disorders, long-term alcohol abuse or prolonged use of medications such as metformin or proton pump inhibitors. As we age, the amount of stomach acid naturally declines, which can also decrease the ability to absorb B12.
Which patients are most at risk of impaired B12 absorption?
Older adults are one obvious group to watch. According to the NIH, between 3% and 43% of community-dwelling older adults may have vitamin B12 deficiency depending on the definition used, and atrophic gastritis in older adults can decrease intrinsic factor production and hydrochloric acid secretion, reducing absorption.
Other groups at increased risk include people with pernicious anemia or gastrointestinal disorders, those who have had gastrointestinal surgery and people who follow vegetarian diets, since natural food sources of vitamin B12 are limited to animal foods.
Intrinsic factor makes a big difference
Rather than supplying B12 alone, supplements like Biotrinsic Intrinsic Factor combine intrinsic factor with methylcobalamin B12 and folate. According to Dee Cee Laboratories, this formula enhances absorption and utilization in addition to supplying it. Each serving contains 1,000 mcg of vitamin B12 as methylcobalamin and 800 mcg DFE of folate, and the product states it meets USP 2040 disintegration standards for maximum bioavailability.
The NIH identifies methylcobalamin as one of the metabolically active forms of vitamin B12. That fact gives clinicians a straightforward way to discuss the product’s rationale with patients: The formula is built around a highly usable form of B12 plus the intrinsic factor needed for absorption, addressing not just intake but the step between swallowing a capsule and actually making use of what is inside.
There’s folate, too
Folate adds another layer of nutritional support. The NIH describes folate3 as a water-soluble B vitamin that functions as a coenzyme in single-carbon transfers involved in DNA and RNA synthesis and amino acid metabolism. Folate is also involved in the conversion of homocysteine to methionine. Because folate and vitamin B12 are metabolically connected in these foundational cellular processes, pairing them in the same formula makes practical sense for patients who need oral B12 support as part of a broader nutrition plan.
Final thoughts
For some patients, vitamin deficiency isn’t just about the vitamin, but about the mechanism that allows the body to use it. A supplement that addresses the deficiency and the underlying reason for it can make a huge difference in how a patient feels. Patients with age-related absorption issues, digestive concerns or dietary patterns that may leave them short on B12 due to impaired absorption may greatly benefit from a product designed with absorption in mind.
That is the niche Biotrinsic Intrinsic Factor is built to fill. Combining intrinsic factor, methylcobalamin B12 and folate in one formula gives you a more targeted option to consider when you recommend vitamin B12 support to patients.
References
- Al-Awami HM, et al. Physiology, Gastric Intrinsic Factor. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; January 2024. https://www.ncbi.nlm.nih.gov/books/NBK546655/. Accessed March 25, 2026.
- National Institutes of Health Office of Dietary Supplements. Vitamin B12: Fact Sheet for Health Professionals. Updated July 2, 2025. https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/. Accessed March 25, 2026.
- National Institutes of Health Office of Dietary Supplements. Folate: Fact Sheet for Health Professionals. Updated November 30, 2022. https://ods.od.nih.gov/factsheets/Folate-HealthProfessional/. Accessed March 25, 2026.
FAQ
What makes Biotrinsic Intrinsic Factor different from other vitamin B12 supplements?
It’s not just a B12 supplement. Biotrinsic Intrinsic Factor contains B12 as well as intrinsic factor, critical to the body’s absorption of B12, plus folate.
What is intrinsic factor?
Intrinsic factor is a glycoprotein produced by the stomach’s parietal cells that binds with B12 and helps carry it to the distal ileum for absorption.
What does vitamin B12 do?
B12 is critical to healthy nerve development, red blood cell formation, cellular metabolism and clearing the body of cellular waste products.
