Environ Int 84:8289
Why the sudden shift
Those on Certain Medications : Some medications, such as metformin (for diabetes) or proton pump inhibitors (for acid reflux), can interfere with B12 absorption

Product Facts Product Facts Ingredients: Purified (deionized) water, Aloe barbadensis (aloe vera) leaf gel, vegetable glycerin, Prunus amygdalus dulcis (sweet almond) oil, extra virgin Cocos nucifera (coconut) oil, Simmondsia chinensis (jojoba) seed oil, glyceryl stearate, cetyl alcohol, stearic acid, beeswax, Theobroma cacao (cocoa) seed butter, Setria glutathione [as L-glutathione (oxidized)], phenoxyethanol, d-panthenol (vitamin B-5), allantoin, vitamin E (as d-alpha tocopheryl acetate), soy lecithin, potassium hydroxide, xanthan gum, Origanum vulgare (oregano) leaf extract, Thymus vulgaris (thyme) leaf extract, Cinnamomum zeylanicum (cinnamon) bark extract, Rosmarinus officinalis (rosemary) leaf extract, Lavandula angustifolia (lavender) flower extract, Citrus medica limonum (lemon) peel extract, Mentha piperita (peppermint) leaf extract, Olea europaea (olive) leaf extract
Nature 579 , 433437 (2020)