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Following this, additional studies demonstrated the ability of the purified Zot protein to increase intestinal permeability exhibited by significant decreases in both jejunal and ileal tissue transepithelial electrical resistance (TEER) (18)

27 The other RCT found no significant mean differences between B12 and placebo
This guide explains what Aetna covers, what you will pay, and how to get approved

Caution: These are anecdotal and not peer-reviewed

By controlling the ingredients, you can ensure it contains no preservatives or additives such as carboxymethyl cellulose (cellulose gum) and mannitol as many pre-packaged B12 injection kits did