- For calcium to be bioavailable, eggshells must be:
- Thoroughly cleaned
- Sterilized at high heat (≥250°F/121°C for 15+ minutes)
- Milled into a very fine, uniform powder (like pharmaceutical-grade calcium carbonate)
- Most home methods (boiling + coffee grinder) don’t achieve this standard.
 Safer, More Reliable Calcium Sources
Instead of risking homemade eggshell powder, consider these well-absorbed, contaminant-free options:
- Dairy: Yogurt, milk, cheese (excellent absorption due to lactose and vitamin D)
- Leafy greens: Collards, kale, bok choy (low-oxalate greens = better calcium uptake)
- Fortified foods: Plant milks, tofu, orange juice with added calcium + vitamin D
- Supplements: Calcium citrate or carbonate from reputable brands (USP Verified)
 Tip: Pair calcium-rich foods with vitamin D (sunlight, fatty fish, eggs) and magnesium (nuts, seeds, whole grains) for optimal bone health.
 
