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Some research also notes changes in carnitine metabolism and reduced ketosis during fasting in obese cats (Blanchard G, 2002)

However, upper limits exist for zinc, and excessive dosing can actually impair immune function reinforcing the need for medical supervision in IV vitamin therapy ingredients

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doi: 10.1111/j.1471-4159.2010.06764.x

A dose-response meta-analysis suggested that the effect may depend on baseline carnitine status, dosage, and lifestyle factors [5]

Fallahi, Front Endocrinol (Lausanne) 2021)