Supplements for firefighters and first responders

The first-responder stack — rationale by ingredient

Omega-3 EPA/DHA 1–2 g/day

Sudden cardiac events on or shortly after fire suppression are the leading cause of firefighter line-of-duty deaths. Omega-3 supports the cardiovascular secondary-prevention picture — a defensible adjunct alongside annual medical surveillance, BP and lipid management, and fitness testing.

Vitamin D3 to a 25-OH-D target of 30–50 ng/mL

Vitamin D status, immune function, bone density, and CV outcomes all interconnect. Test and supplement to target. Shift workers have lower daytime sun exposure than day-shift counterparts, so deficiency is more common.

Magnesium glycinate 300–400 mg evenings (or before day-sleep)

Sleep maintenance after a difficult call, mild BP-lowering, and the broader stress-recovery role. Glycinate is well-tolerated and pairs with melatonin without sedating into next-shift drowsiness.

Creatine monohydrate 3–5 g/day

Operational fitness, repeat-effort capacity (extrication, victim drag, stair climbs in turnout gear), and a small cognitive resilience benefit under sleep deprivation. The mass gain is acceptable for most operational athletes.

Caffeine, time-anchored to early-shift use

The best-evidenced alertness ergogenic. Strategic — not constant — use. Keep within the first 4–5 hours of a night shift; later intake meaningfully impairs subsequent day-sleep and next-shift readiness.

Low-dose melatonin (0.3–0.5 mg) before day-sleep

The chronobiotic dose. Use post-shift to anchor day-sleep onset; not the 5–10 mg sedating dose. Pair with blackout curtains and a phone-on-DND protocol.

NAC 600–1200 mg/day in heavy-exposure periods

Glutathione precursor; mechanism rationale for smoke and PAH exposures. Trial evidence is mostly indirect (small COPD and exacerbation trials), but the mechanistic case is real and the safety profile is good. Consider during high-exposure wildland deployment periods.

Iron repletion only if ferritin is low

Test ferritin if fatigue or operational endurance is suboptimal. Don't load empirically — iron overload is common enough.