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Topical scalp: 0.5 % solution, 12 ml twice daily for at least 6 months

Duration by dose The number of weeks your vial lasts depends entirely on your weekly dose: If you follow the standard titration schedule starting at 2.5 mg and increasing every four weeks, a single 60 mg vial provides: Weeks 1-4 at 2.5 mg = 10 mg used Weeks 5-8 at 5 mg = 20 mg used Weeks 9-12 at 7.5 mg = 30 mg used Total: 60 mg consumed over 12 weeks That is three full months of a complete titration protocol from one vial

Early signs of declining B12 levels include profound fatigue, tingling or numbness in extremities, cognitive changes, and balance problems requiring medical review

As you say you've " tried oral B12, which made no difference " it may well be that you have an absorption problem and will need injections