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B vitamins B6, B9, B12, and Biotin have a distinct chemical structure known as methylation
[American Journal of Physiology] Laskowska M, Oleszczuk J
Trace amounts can form during production but the EU's Scientific Committee on Consumer Safety has concluded that levels at/below 10 ppm in finished products are safe (commercial products consistently fall within acceptable margins)
Abec Abec del Sistema de Factura Electrnica.
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