Best supplements for immune system — vitamin D, zinc, vitamin C, and others. What evidence supports vs marketing claims.

Best supplements for energy — addressing deficiencies (iron, B12, vitamin D), CoQ10, and others. Why most “energy” supplements don’t work.

Best supplements for sleep — melatonin, magnesium, glycine, and others. Evidence levels and when CBT-I is the better choice.

Best supplements for depression — omega-3s, vitamin D, SAMe, St. John’s Wort, and more. Evidence levels and when to seek…

Best supplements for anxiety — what evidence supports magnesium, L-theanine, ashwagandha, and others. Limitations and when to seek treatment.

Signs of folate deficiency — fatigue, anemia, mouth sores. Causes and pregnancy considerations.

Signs of magnesium deficiency — muscle cramps, fatigue, anxiety, and other symptoms. Why testing has limitations.

Signs of iron deficiency — fatigue, restless legs, hair loss, and other symptoms even before anemia develops.

Signs of B12 deficiency — fatigue, neuropathy, cognitive issues. Common causes and who needs testing.

Signs of vitamin D deficiency — fatigue, bone pain, mood changes, and other symptoms. Risk factors and when to get…