propyonil-l-carnitine allergy The Nutraceutical Value of Carnitine and Its Use in Dietary Supplements Propionylcarnitine | Carnitine Acetyltransferase Metabolite
Description
BMC Geriatr

It acts as a cyanide antidote

A., Dragani, L., Valente, R., et al

Signs that you may not be getting enough Vitamin C include: fatigue and weakness, dry skin and hair, irritability, slow wound healing, getting ill frequently, bruising easily, bleeding gums and anaemia

So, while 500 mg might work perfectly for one person, someone else might need 1,000 mg or more to see noticeable changes