Calcined Ark Shell — Safety & Interactions
Duan Wa Leng Zi · Concha Arcae Praeparata
Use with caution. Practitioner review recommended before use.
Contraindications
- Spleen-Stomach deficiency-cold with weak digestion but no acid regurgitation or heat irritation
- Routine long-term use when low stomach acid rather than hyperacidity is the real problem
Cautions
- Like other calcium-rich shell medicines, Duan Wa Leng Zi can interfere with the absorption of certain medications when taken at the same time
- Only properly cleaned and medicinally calcined shell should be used; shell products from uncertain sourcing may carry contamination or microbial residue risk
- The processed powder is aimed at excess acidity and ulcer irritation, not at indiscriminate long-course supplementation
- MSK page not found - drug interaction data not available from Memorial Sloan Kettering integrative medicine database
Drug Interactions
| Drug Class / Substrate | Mechanism | Severity | Source |
|---|---|---|---|
| Fluoroquinolone antibiotics (ciprofloxacin, levofloxacin) - calcium-rich shell minerals can chelate the drug and reduce absorption; separate by several hours | |||
| Tetracycline antibiotics - calcium binding can reduce antibiotic bioavailability; stagger dosing | |||
| Levothyroxine - calcium-containing minerals may impair thyroid hormone absorption; separate by at least 4 hours | |||
| Iron supplements - concurrent calcium can reduce iron absorption; take at different times | |||
This information is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before using herbal medicines, especially if you take prescription medications.