l-carnitine liver enzymes Role of carnitine in disease | Nutrition & Metabolism L-Carnitine (500mg)

Monocarboxylate transporter 8 (MCT8) is the primary carrier for T3 and T4, while organic anion transporting polypeptide 1C1 (OATP1C1) facilitates T4 transport (18)

There are other nutrients that are not directly involved in the chemical pathways of metabolism but are however important for energy production and maintaining mitochondrial function such as

Exposure to heat, light, or air can have negative effects related to product quality

I completely understand the parent desire to protect your child from discomfort (and to want to make sure they sleep), but many children do not have fevers after shots, and handle them fine