KAL - Vitamin B-12 Spray, 2500 mcg, 2 fl oz spray Go to amazon.com Related posts The 13 best b12 spray for 2022 FeatureServing Size - 1 spray DescriptionJust one spray under the tongue delivers a pleasant grape-flavored splash of 2500 mcg of Vitamin B-12 (as Cyancobalamin) and 1.5 mg of Stevia Leaf extract.