b12 home injections

Is it true that bac water has life of 30 days after 1st used then toss out??? Or is this stuff still usable ?? : r/Retatrutide Size:1000 mcg/ml - 10 ml (Pack of 1) Calcium gluconate Injection https://5.imimg.com/data5/SELLER/Default/2025/9/543345430/QD/AG/BX/106926830/cyanocobalamin-vitamin-b12-injection-500x500.jpeg The injection doesn’t just top up a vitamin

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