What do studies say about Ferritin Training?

The provided context contains no studies on 'Ferritin Training'. Ferritin is a marker of iron stores, but the available information only covers DNA tests (e.g., ACTN3, APOE, polygenic risk scores) and general gut health. Without specific evidence from the knowledge base, no scientifically grounded statement about Ferritin Training can be made. The term may be used in a marketing context, but the evidence level is unclear. Any training or supplementation based on ferritin levels should be medically supervised, as both iron deficiency and overload carry health risks.