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Other at-risk groups include people with coeliac or Crohns disease, those who have had weight loss surgery, and those with atrophic gastritis or pernicious anaemia
Dark circles are notoriously hard to treat with topical products, but most of our 40-and-up testers reported improvements after using Alastin Restorative Eye Complex, a pick in our guide to the best eye creams
(For a full overview of vitamin B12 benefits beyond mood, start with our master guide.) When the brain doesn't have the raw materials it needs to produce neurotransmitters and maintain healthy nerve function, mood is one of the first things to shift
Persistent fatigue or weakness Numbness or tingling, especially in the hands and feet Memory loss, brain fog, concentration difficulties, or mood changes Pale or jaundiced skin Shortness of breath or dizziness In some cases, you may not show any signs of abnormal B12 levels
What we do not know Whether popular longevity and recovery claims hold up in well-controlled human studies
