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In cats, the most serious of these adverse consequences is the occurrence of invasive sarcomas (mostly fibrosarcomas), so called feline injection-site sarcomas (FISS), that can develop within the skin at sites of previous vaccination (Fig

If the product looks suspicious, reconsider whether it makes sense to use it

Some users report more reactions with compounded formulations due to preservatives (benzyl alcohol) and additives ( niacinamide , B12)

This allows for maximum absorption and fast-acting relief for any symptoms you may be feeling

Certain bulk drug substances for use in compounding that may present significant safety risks

Post-injection, it's generally safe to resume your usual activities