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If you have any sort of GI issue (GERD, reflux, SIBO/SIFO, yeast problems, chronic constipation, etc.) you will have problems taking oral forms of vitamin B12

These are known as third-line antioxidants

On the other hand, trying to immobilize the same amount of aptamer on M-270 beads resulted in 54 g (3.34 nmol, 13.4% of starting aptamer amount, 223 pmol/mg bead) aptamer immobilization on the beads corresponding to 5.38 g aptamer/mg of the beads (see Supplementary Table S2 online)

Concentration: 1000 mcg/mL

The hypothesis mentioned above gives a mechanistic answer for the characteristic presence of the SUF system in protists