Immune

HEPA air purifiers are a well-established, evidence-backed tool for reducing airborne allergens and particulate matter, with strong data supporting symptom relief for allergy and asthma sufferers.

A well-established antioxidant essential for immune function, collagen synthesis, and iron absorption — evidence supports modest immune benefits, especially under physical stress.

The sunshine vitamin most indoor-dwellers are low in — strong evidence for bone health and immune function, reasonable for energy.

Specifically the aged (Kyolic-style) form of garlic with several RCTs showing modest but real reductions in blood pressure and cholesterol.

Cold water immersion has decent evidence for reducing post-exercise soreness and inflammation, but the hype often outpaces what the science actually supports.

The body's most abundant amino acid with strong evidence for gut barrier integrity and immune support in stressed populations, but less clear benefit for healthy people.

N-acetyl cysteine is a well-established glutathione precursor with strong evidence for liver protection and respiratory support, and decades of clinical use.

Live microorganisms with real evidence for specific gut conditions — but strain specificity matters enormously, and most products don't tell you enough.

A well-studied flavonoid with decent anti-inflammatory and immune evidence, plus emerging interest as a senolytic when paired with dasatinib.

An essential trace mineral critical for thyroid function and antioxidant defense — beneficial for those with low selenium status, but excess carries risk.

An essential fat-soluble vitamin for vision, immune function, and skin integrity — most people get enough from food, but deficiency remains a global health concern.

An essential trace mineral with good evidence for immune support — most people get enough from food, but certain groups benefit from supplementation.

A medicinal mushroom with centuries of traditional use and interesting mechanistic data, but limited rigorous human evidence for immune and sleep claims.