is oral replacement better than injectable b12 The Advantages of Injections Versus Supplements: Shawn Veiseh, M.D.: Family Medicine Vitamin B-12 Injections Vs Oral
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Start with proper dosing

Whole grains, legumes, nuts, and seeds are good sources of thiamine

2 each from India, Israel and Netherlands and 1 each from Greece, Spain, Switzerland, Brazil, New Zealand and Korea)
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Impressively, the 5-Amino-1MQ-treated mice did not show adverse effects during the experiment
