Pantothenic acid (B5) is one of those nutrients that prob doesnt get enough attention considering what it actually does.
Its the precursor to coenzyme A. CoA is required for approximately 4% of all known enzymatic reactions. In mitochondria, CoA functions as the acyl group carrier for PDH and alpha-KGDH in the TCA cycle, the entire fatty acid beta-oxidation pathway, and leucine metabolism. Also needed for the first step of cholesterol and fatty acid biosynthesis.
But the really interesting part to me is the heme connection.
Heme synthesis requires succinyl-CoA. When B5 is low → CoA production drops → succinyl-CoA drops → heme synthesis is rate-limited.
Pantothenate deficiency depresses heme biosynthesis and causes anemia as well.
So B5 deficiency is a dual hit on mitochondria: 1. Starves the TCA cycle of its carrier molecule (↓ energy production directly) 2. Impairs heme synthesis (↓ complex IV → ↑ oxidative stress)
This converges on the exact same outcome as B6, B2, zinc, iron, copper, and biotin deficiency btw. They all hit heme synthesis at different points. Seven different nutrient deficiencies, one chokepoint (systems biology)
If you're seeing signs of poor ETC function on testing like mitoswab, B5 status is worth looking into alongside the more commonly assessed cofactors.