glutathione heart system enhancement for cardiac protection: pharmacological options against oxidative stress and ferroptosis Reduced glutathione (GSH) and lipid

The frequency and dosage can be tailored to the clients specific needs, with visible results often becoming apparent after several treatments

Other reported effects include: Headaches and dizziness Nausea and gastrointestinal discomfort Allergic reactions to B12 formulations (rare) If you experience symptoms suggesting a severe allergic reaction (difficulty breathing, severe rash, swelling of face/throat), seek emergency medical attention immediately by calling 999 or attending A&E

So I tried to dig into why this could potentially be the case

Wreghitt, TG (December 1993)

Vagal afferent innervation of the Airways in Health and Disease