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If you believe you haveor have been told by a healthcare professional that you havea B12 deficiency, you must seek medical advice from a qualified medical practitioner

High levels rise slowly

164 In a randomized crossover trial in 50 subjects with male infertility, one month of treatment with a supplement containing pine bark extract plus L-arginine (an amino acid precursor to nitric oxide which regulates blood vessel function) increased semen volume, sperm number and concentration, motility, and vitality, and improved sperm morphology compared with placebo

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