numi glutathione NutriDyn Reduced Glutathione Capsules
Description
Yes, NAC dosage for dogs is contraindicated in animals which have a known hypersensitivity reaction to the drug

B12 shots are generally not the best starting point if your sole goal is losing weight

Chapman, T

Clinical, nerve conduction and nerve biopsy study in vitamin B12 deficiency neurological syndrome with a short-term follow-up
doi: 10.1016/0168-3659(90)90015-L

This pulsing strategy may help maintain the collagen synthesis benefits while periodically reducing MMP stimulation
