3 Signs of Low B12 After 60 — And Why a Normal Blood Test Can Still Miss It

Three early signs that your body may be running short of vitamin B12 after 60 — and the reason a standard blood test can come back "normal" while your nerves are still short. Vitamin B12 keeps the protective insulation around your nerves in good repair. When it runs low, the first place it usually shows is the longest nerves in the body, which is why this tends to start in both feet rather than the hands. The three signs covered in this video are tingling or numbness in both feet that is worse at night, feeling unsteady walking in the dark, and a change in how easily words and names come to you. The part that catches most people out is the blood test. A standard B12 level measures the total amount in your bloodstream, including the large portion that is bound to a carrier your tissues cannot use. There is also a band at the lower end of the reference range where the number reads as normal but the picture is far from settled. This video explains what that grey zone is, what methylmalonic acid measures and why it answers a different question, and which follow-up tests exist. We also go through what commonly drains B12 in this age group: the natural drop in stomach acid with age, long-term metformin use, and long-term omeprazole or other acid-reducing medication. There is a section on how folic acid can mask the anaemia that used to catch this diagnosis, including where researchers genuinely disagree. And there is an honest look at what supplementation does and does not do, because the trial evidence is more mixed than most videos on this subject admit. Nothing here is a reason to stop a prescription — it is a reason to ask one specific question at your next appointment. If videos like this are useful to you, subscribing helps us keep making them. One question for the comments, and please answer each other and not just us: when you walk in the dark, do you reach for the wall? And is that new in the last few years, or has it always been that way? CHAPTERS 0:00 The three signs 1:01 What B12 does for your nerves 2:41 Sign 1: Tingling in both feet 4:03 Why it looks like diabetic neuropathy 5:01 Sign 2: Unsteady in the dark 5:24 How your body knows where your feet are 7:00 Sign 3: Trouble finding your words 8:47 What a B12 blood test actually measures 9:36 The grey zone inside the normal range 10:09 What methylmalonic acid shows 10:46 Two other tests worth knowing 11:36 What drains your B12 12:26 Metformin and B12 13:20 Omeprazole and reflux medication 15:13 How folic acid can hide it 17:50 Two people, two different answers 20:00 Does taking B12 actually help 20:46 What the 2015 trial found 22:37 When to be seen promptly 23:14 What to ask for at your appointment RESEARCH & SOURCES Long-term metformin use and low or borderline B12, with nerve symptoms more common in metformin users whose B12 was low — Journal of Clinical Endocrinology & Metabolism, 2016 (Diabetes Prevention Program Outcomes Study) Two or more years of proton pump inhibitor or H2 blocker use associated with B12 deficiency, with a stronger association at higher daily doses — Journal of the American Medical Association, 2013 (Kaiser Permanente Division of Research) Serum B12 lacks sensitivity: a substantial share of older adults with results in the lower part of the normal range had raised methylmalonic acid — Framingham cohort data, as reported in Journal of Nutrition, Health & Aging, 2004 B12 supplementation in older adults with moderately low levels raised blood markers sharply but did not change nerve conduction, cognition or clinical examination at twelve months — American Journal of Clinical Nutrition, 2015 (London School of Hygiene & Tropical Medicine) Review of ten randomised trials: benefit in overt deficiency, oral treatment comparable to injections, no significant benefit in subclinical deficiency — systematic review, 2025 The case that excess folic acid masks and may accelerate B12-related nerve damage — Food and Nutrition Bulletin, 2024 The opposing case, that the historical record does not support folic acid accelerating that damage — American Journal of Clinical Nutrition, 2019 Association between combined B12 markers and cognitive measures over time — Framingham Heart Study Offspring Cohort, 2025 #VitaminB12 #B12Deficiency #SeniorHealth #HealthAfter60 #Neuropathy This video is general information and is not medical advice. It cannot take account of your individual situation. Please speak to your own doctor or pharmacist before changing any medication or starting any supplement.