If tiredness is caused by a confirmed vitamin B12 deficiency, many people report noticing changes within: A few days to one week some individuals feel improvement in energy levels relatively quickly
Additional risk factors include: Age over 60 years (reduced stomach acid production) Autoimmune conditions (thyroid disease, vitiligo, type 1 diabetes) Family history of pernicious anaemia Chronic alcohol consumption Diagnosis and Testing Diagnosis of vitamin B12 deficiency anaemia requires a combination of clinical assessment, laboratory investigations, and sometimes specialist testing

Women diagnosed with a B12 deficiency will usually have one of the following factors: 40 years of age or over A vegetarian or vegan diet Heartburn medication Crohns disease Nicotine consumption Frequent alcohol consumption Anemia Atrophic gastritis (thinning of stomach lining) Symptoms of B12 deficiency may include: Dizziness/vertigo Numbness or pins and needles Pale skin Memory deficiency Low energy Blurred vision Mood swings Smooth/sore tongue Loss of muscle strength Shortness of breath Heart palpitations Gastrointestinal issues Skin, nail, and hair deficiencies Unfortunately, this constellation of symptoms can look like and be related to numerous factors
Costa ND, Stevenson PM
14 Weeks: You might notice subtle changes, like better hydration in your skin or slightly less "crunchiness" in your joints during your morning warm-up