Vitamin B12 - Health Professional Fact Sheet
https://ods.od.nih.gov/factsheets/Vitaminb12-HealthProfessional/
WEBFor example, absorption is only about 2% at doses of 500 mcg and 1.3% at doses of 1,000 mcg [ 25 ]. In addition to oral dietary supplements, vitamin B12 is available in sublingual preparations as tablets or lozenges [ 23 ]. Evidence suggests no difference in efficacy between oral and sublingual forms [ 26, 27 ].
DA: 23 PA: 34 MOZ Rank: 16