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Many causes of inflammation could be associated with FISS development, and FISS can occur in animals following vaccination with inactivated, recombinant or modified live vaccines as well as with non-vaccine injections

However, like any therapeutic agent, individual reactions may vary

Krimpenfort P, Berns A

Takeaway: noticeably better for adults with reduced stomach acid or intrinsic factor issues, affordable (costs roughly the same as standard tablets), and the safest default choice for adults 60+

[DOI] [PMC free article] [PubMed] [Google Scholar] 243.Bruno K.J., Freet C.S., Twining R.C., Egami K., Grigson P.S., Hess E.J