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Unnecessary supplementation can cause artificially high levels

It may, however, improve energy levels (assuming you are deficient) which may allow you to increase your activity and help balance hormones leading to weight loss

For more on pairing nutrients effectively, see How to Take Vitamin C and Glutathione for Best Results or What Is the Best Vitamin C to Take with Glutathione?.

Additionally, Du, J., Liu, X., Sun, J

[15] [16] Tests may include full blood count, serum B12 levels, anti-intrinsic factor antibodies (to diagnose pernicious anaemia), and sometimes methylmalonic acid or homocysteine levels when the diagnosis is uncertain