For comparison between tap waters, these are some pH values from past winners of the municipal water category of the annual Berkeley Springs International Water Tasting competition
Likewise in oral supplements such as tablets and capsules, cyanocobalamin is still the most used active ingredient

Seek prompt medical advice if you experience: Severe or rapidly worsening joint pain that significantly impairs function or mobility A hot, swollen, very painful joint with fever this could indicate septic arthritis requiring SAME-DAY emergency hospital assessment Symptoms of severe allergic reaction after B12 injection (breathing difficulty, facial/tongue swelling, widespread hives, dizziness/collapse) call 999 immediately Systemic symptoms such as unexplained weight loss, night sweats, or profound fatigue Neurological symptoms including weakness, numbness, balance problems, or cognitive changes Symptoms affecting multiple joints simultaneously, particularly if symmetrical (both hands, both knees) Morning stiffness lasting more than 30 minutes , which may suggest inflammatory arthritis Your GP will conduct a thorough clinical assessment, including detailed history-taking and physical examination
Once a sealed vial passes its printed expiration date, replace it
Better to wait