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Yes, fluoroquinolones can cause nephrotoxicity (damage to the kidneys)

Vitamin B12 If you are injecting into your thigh muscle , then a 25 gauge x1 inch needle should be OK .Obtainable from Medisave.co.uk It is possible to get a 27 gauge needle from exchangesupplies.org , but it is longer -1 1/2

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Possible NAD+ injection side effects tend to be mild and short lived as your body adjusts, and may include: Injection site discomfort Brief flushing Headache Mild nausea Temporary fatigue Report anything persistent or severe to your provider, who monitors your response throughout treatment