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One of the things I've also started using as a biomarker is Saccharomyces cerevisiae antibodies, which is specifically for colitis and Crohn's

Vitamin B12 (also known as cobalamin) is a water-soluble vitamin that plays a key role in: Normal red blood cell formation Normal energy-yielding metabolism Function of the nervous system Reduction of tiredness and fatigue DNA synthesis Normal psychological function In the UK, these are recognised health claims for vitamin B12 under authorised nutrition and health regulations

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B12 injections are better for people with absorption issues or moderate-to-severe deficiency because they bypass the digestive system