Evidence supporting the use of: Oyster
For the health condition: Calcium Deficiency

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Oyster is used to support or treat calcium deficiency primarily due to its high natural calcium content. Oyster shells are composed mainly of calcium carbonate, making them a rich source of dietary calcium. In traditional medicine systems, especially in East Asia, powdered oyster shell has long been used as a calcium supplement. Scientifically, several studies have validated that oyster shell calcium can be an effective supplement for increasing calcium intake and improving bone mineral density, particularly in populations at risk of deficiency. For example, clinical studies have shown that oyster shell-derived calcium is bioavailable and can help maintain serum calcium levels, though it is generally considered similar in efficacy to other forms of calcium carbonate.

However, oyster shell calcium supplements must be assessed for purity, as natural sources can sometimes contain contaminants like lead. Regulatory bodies and scientific reviews recommend ensuring that oyster shell calcium is purified before use to avoid heavy metal exposure. The evidence supporting its use is moderate (rated 3/5) because while its basic efficacy as a calcium source is well-established, there is no unique benefit compared to other calcium carbonate supplements, and concerns about contamination must be managed. Overall, oyster shell is a recognized and scientifically supported option for treating or preventing calcium deficiency, provided it is properly processed and sourced.

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