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Elevated homocysteine levels are associated with increased risk of heart attack, stroke or dementia

My oxygen level and breathing have been fine

Medical conditions: Certain health conditions, such as diabetes, thyroid disorders, nerve compression (radiculopathy), spinal stenosis, and liver disease (e.g., cirrhosis), can increase the risk

Niacinamide: Helps brighten skin tone and reduce pigmentation

Oral therapy is generally unsuitable for pernicious anaemia or conditions affecting the terminal ileum (where B12 is absorbed), as these patients lack intrinsic factor or have damaged absorption sites

This enabled commercial use even without full drug approval