Script-only is fastest and cheapest
However, there may be long-term adverse health effects from storing higher than normal levels of B12 in the body

Galactomyces Ferment Filtrate, Glycerin, Cetyl Ethylhexanoate, Propanediol, Dicaprylyl Carbonate, 1,2-Hexanediol, Betaine, Cetearyl Alcohol, Polyglyceryl-10 Laurate, Methyl Trimethicone, Silica, Cetearyl Olivate, Panthenol, Phenyl Trimethicone, Potassium Cetyl Phosphate, Water, Sorbitan Olivate, Bisabolol, Ammonium Polyacryloyldimethyl Taurate, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Dipropylene Glycol, Squalane, Laminaria Japonica Extract, Eclipta Prostrata Leaf Extract, 3-O-Ethyl Ascorbic Acid, Glutathione, Ethylhexylglycerin, Fragrance, Lavandula Angustifolia (Lavender) Oil, Coptis Japonica Root Extract, Xanthan Gum, Butylene Glycol, Adenosine, Fructooligosaccharides, Sorbitan Isostearate, T-Butyl Alcohol, Hydrogenated Lecithin, Beta-Glucan, Hydrolyzed Hyaluronic Acid, Ascorbic Acid, Tocopherol, Allantoin, Ceramide Np, Oryza Sativa (Rice) Bran Oil, Oryza Sativa (Rice) Bran Extract, Glyceryl Stearate, Phytosphingosine, Cholesterol, Ceramide Ap, Ceramide As, Ceramide Ns, Caprylyl Glycol, Ceramide Ng, Ceramide Eop, Linalool, Limonene

There is no single universally agreed UK guideline specifically for B12 supplementation after gastric banding, but recommendations from BOMSS and standard UK clinical references provide useful direction
Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1 trial)
Hydration IV Drip IV hydration therapy benefits those recovering from a loss of fluids through vomiting, diarrhea, or hangover, but also athletes wanting to maximize their performance