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Some researchers note that DSIP does not appear to induce tolerance with repeated use, while others recommend cycling as a precautionary measure
avoid foaming or vigorous agitation
For antimicrobial protection, avoid rubber closures, which can allow contamination through the hole where the needle passes, and may contain rubber additives
But age, gastrointestinal issues, or other factors might prevent you from getting enough B12 from your daily diet
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