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The evidence that any specific formulation carries a different safety profile is limited

It declines with age, and lower NAD+ is associated with slower metabolism and the changes we lump together as getting older. NNMT, meanwhile, consumes the raw materials your body uses to make NAD+ and in fat tissue, NNMT is often overexpressed, which can drag NAD+ down right where you least want a sluggish metabolism

It is all about finding what works best for your child

Severe deficiency can contribute to fatty liver changes, which is one reason choline gets framed as liver support. Details are summarized in the NIH ODS Choline fact sheet for health professionals