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doi: 10.1161/ATVBAHA.120.315267 204 NotzQ.HerrmannJ.SchlesingerT.HelmerP.SudoweS.SunQ.et al
Comprehensive womens health support from a board-certified gynecologist
Last reviewed: June 11, 2026 Last updated: June 11, 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
Key Takeaways: B12 shot effects stay for about one to two weeks Some people notice benefits lasting up to a month If absorption is an issue, weekly injections might be necessary Energy, mood, and metabolism can improve at different paces Your past health impacts how long the effects stay
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