The conventional way of fixing a vitamin B12 deficiency has been through intramuscular injections
This may also depend on your diet, how many prebiotic foods you consume, and other probiotic foods in your diet as well
Table 7 Alterations in the gut microbiota abundance in patients with MDD

The full ingredient list: Ingredients: Aqua (Solvent), Tetrahexyldecyl Ascorbate (Antioxidant), Dimethicone (Skin conditioning agent), Glycerin (Humectant), C9-12 Alkane (Emollient), Ascorbyl Glucoside (Skin brightening agent, Silica (Opacifying agent), Pyrus Malus (Apple) Fruit Extract (Skin conditioning agent), Hydrogenated Lecithin (Skin conditioning agent), Polyglyceryl-6 polyricinoleate (Emollient), Mannitol (Skin conditioning agent), Sodium Hydroxide (Solvent), Acrylates/C10-30 Alkyl Acrylate Crosspolymer (Viscosity controlling agent), Xanthan Gum (Emulsion stabilizer), Glutathione (Antioxidant), Ergothioneine (Antioxidant), Oryza Sativa (Rice) Bran Extract (Skin conditioning agent), Hydroethyl Acrylate/Sodium Acryloylmethyl Taurate Copolymer (Dispersing agent), Cetyl Alcohol (Emulsion stabilizer), Caprylyl Glycol (Skin conditioning agent), Lysine Carboxymethyl Cysteinate (Skin conditioning agent), Coco-Caprylate/Caprate (Skin conditioning agent), Tocopherol (Skin conditioning agent), Sodium Citrate (pH adjuster), Sodium Phytate (Chelating agent), Hexylene Glycol (Emulsifier), Ethylhexylglycerin (Skin conditioning agent), Helianthus Annuus (Sunflower) Extract (Emollient), Urea (Humectant), Caprylic/Capric Triglyceride (Skin conditioning agent), Sodium PCA (Skin conditioning agent), Rosmarinus Officinalis (Rosemary) Leaf Extract (Skin conditioning agent), Polysorbate 60 (Surfactant), Sorbitan Isostearate (Surfactant), Trehalose (Humectant), Ascorbic Acid (Skin conditioning agent), Glucose (Solvent), Vanilla Planifolia Fruit Extract (Skin conditioning agent), Polyquaternium-51 (Humectant), Triacetin (Solvent), Sodium Hyaluronate (Skin conditioning agent), Phenoxyethanol (Preservative)

Site rotation: Move between abdomen, thighs and upper arms to reduce local irritation and lipohypertrophy [9]
Blesa S, Cortijo J, Martinez-Losa M, Mata M, Seda E, Santangelo F, Morcillo EJ: Effectiveness of oral N -acetylcysteine in a rat experimental model of asthma