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When oral B12 may be used Oral B12 may be appropriate for many people who need general supplementation or who have mild deficiency

Nature 431 , 760767 (2004)

10.1002/ana.410420206

In an RDP trial, researchers found that Pycnogenol supplementation improved allergic rhinitis symptoms from birch and other pollen allergy when the supplementation started at least five weeks before the pollen season (51)

Stout JN, Lin P-Y, Sutin J, Higgins J, Grant PE (2022) Magnetic resonance imaging metrics of oxygen extraction fraction: Contradictions or insight into pathophysiological mechanisms

48 However, no studies have been reported in COPD patients