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Athletes taking NMN have also shown improved aerobic exercise capacity 7 and recovery

That makes the evidence promising, but not yet conclusive

Emotional and Mental Symptoms Cortisol has a direct effect on the brain, particularly the hippocampus and prefrontal cortex

Neurological symptoms : Coeliac disease may also present with neurological symptoms, including headaches, migraines, peripheral neuropathy (tingling or numbness in the limbs), and difficulties with concentration or memory, sometimes referred to as "brain fog." Reproductive issues : Women with coeliac disease may experience reproductive challenges, including irregular menstrual cycles, infertility, or complications during pregnancy

That's not a minor difference