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The turquoise graph above depicts the amount of breastmilk for several mothers (top) and the average (bottom)

Even half a milliliter of difference changes your concentration and every dose that follows

Last reviewed: June 7, 2026 Last updated: June 7, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

This isn't just a casual recommendation

Compounded Methylcobalamin injections are prepared outside the FDA approval process and are not reviewed by the FDA for safety, effectiveness, or quality