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Description
B12 tablets are generally well-tolerated with minimal side effects

Locate the Injection Site : The best area for subcutaneous injections is the loose skin between your cats shoulder blades

Tendon Healing Rodent studies demonstrated: Accelerated tendon-to-bone healing Improved biomechanical strength Enhanced collagen organization Reference: Chang et al., 2011 2

The evidence isn't yet at the level of a treatment guideline

Normally no, apart from an achy muscle at the injection site, which normally does not last for more than an hour or so