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Story Source: Materials provided by University of Pennsylvania School of Engineering and Applied Science
Furthermore, there have not been any studies that show that B12 can become toxic or cause any problems (8) (as long as your kidneys are functioning (9))

No microscopic histopathologic changes were noted in the liver, spleen, lung, kidney, brain, thymus, prostate, and ovaries across similar dosing and frequency through 6 weeks in both rat and dog models [67]

No additional stabilizers, fillers, or additives are included

Some protocols may utilize intranasal delivery for specific therapeutic needs

Furthermore, EGFR activation by EGF in the breast milk inhibits TLR4 signaling to protect neonates and infants from necrotizing enterocolitis (21)