Featured stack
The Immune Shield Stack
Quiet support for the immune system that actually has evidence behind it.
Most "immune boosters" are marketing. These four have real data — not for preventing every cold, but for reducing duration and severity and supporting baseline function.
Vitamin D3 + K2 is the single highest-leverage nutrient for immune function, especially above 40° latitude.
Zinc shortens cold duration when taken at the first symptom. 15–30mg daily is the safe maintenance range.
Vitamin C isn't a miracle — but it does reduce cold duration modestly when taken consistently.
A multi-strain probiotic supports the gut lining where 70% of immune tissue lives.
The stack
Grouped by time of day. Tap any supplement for dose details and the science behind it.
Morning
Vitamin D3 + K2
LIFESTYLE2000–5000 IU D3 with 100mcg K2
Critical when sun exposure is limited; supports mood and bones.
- Dose
- 2000–4000 IU50–100 mcg
- Timing
- Morning
Zinc
GOAL15–30mg daily, with food
Supports immune cells, wound healing, and testosterone.
- Dose
- 15 mg
- Timing
- Morning
Vitamin C
GOAL500–1000mg daily
Antioxidant support and immune resilience.
- Dose
- 500 mg
- Timing
- Morning
Probiotic (Multi-strain)
GOALMulti-strain, 10–50B CFU
Supports a diverse gut microbiome.
- Dose
- 10–30B CFU
- Timing
- Morning
FAQ
What if I live somewhere sunny?
Still check a 25(OH)D blood level. Most people are lower than they think, even in sunny climates.
Can I megadose zinc during a cold?
Short bursts up to 50mg/day for a few days are fine. Not long term — it depletes copper.