# Shark Cartilage Calcium

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/shark-cartilage-calcium
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Protein
**Also Known As:** Shark Cartilage Extract, Calcified Shark Cartilage, Marine Cartilage Calcium, Shark Endoskeleton Extract, SCC, Chondroitin-Rich Shark Cartilage, Shark Skeleton Calcium

## Overview

Shark cartilage calcium is derived from the dried, powdered cartilage of sharks and contains bioactive glycoproteins, proteoglycans, and calcium-rich hydroxyapatite as its primary compounds. Its proposed mechanisms center on angiogenesis inhibition via anti-angiogenic proteins such as sphyrnastatin and AE-941, alongside chondroitin sulfate-mediated [anti-inflammatory](/ingredients/condition/inflammation) signaling.

## Health Benefits

• Anti-angiogenic effects demonstrated in preclinical studies (evidence quality: preliminary - no human trials cited) • Anti-tumor proliferation activity shown in vitro and in vivo animal models (evidence quality: preliminary) • [Anti-inflammatory](/ingredients/condition/inflammation) properties identified in fractionated extracts (evidence quality: preliminary) • Anti-collagenolytic effects observed in laboratory studies (evidence quality: preliminary) • [Immune system](/ingredients/condition/immune-support) stimulation attributed to mucopolysaccharides content (evidence quality: preliminary)

## Mechanism of Action

Shark cartilage contains sphyrnastatin-1 and sphyrnastatin-2, proteins that inhibit vascular endothelial growth factor (VEGF) binding and suppress neovascularization by blocking endothelial cell proliferation and migration. Chondroitin sulfate fractions modulate NF-κB signaling pathways, reducing [pro-inflammatory cytokine](/ingredients/condition/inflammation) expression including IL-1β and TNF-α. The hydroxyapatite-bound calcium fraction contributes to [bone mineral density](/ingredients/condition/bone-health) support by supplying bioavailable calcium phosphate for osteoblast matrix mineralization.

## Clinical Summary

Preclinical in vitro and animal studies have demonstrated anti-tumor and anti-angiogenic activity from shark cartilage extracts, including the standardized product AE-941 (Neovastat), but these findings have not translated consistently to human outcomes. A Phase III randomized controlled trial of AE-941 in non-small cell lung cancer (n=379) published in the Journal of the National Cancer Institute (2007) found no statistically significant improvement in survival versus placebo. Smaller open-label studies in osteoarthritis populations reported modest symptomatic relief at doses of 500–4,500 mg/day, but lacked adequate controls and blinding. Overall, the human clinical evidence for shark cartilage calcium across all proposed indications remains insufficient to support efficacy claims.

## Nutritional Profile

Shark cartilage calcium is primarily a protein-mineral matrix. Protein content is high, typically 30–60% by dry weight, composed largely of type II collagen and glycosaminoglycans (GAGs) including chondroitin sulfate (10–25% by weight). Calcium constitutes approximately 10–20% of dry weight, present as calcium phosphate (hydroxyapatite) embedded in the cartilaginous matrix. Phosphorus is present at roughly 5–10% by dry weight, maintaining a Ca:P ratio of approximately 2:1. Contains trace minerals including magnesium (0.2–0.5%), zinc, manganese, and iron in minor quantities. Bioactive compounds include chondroitin sulfate (~100–250 mg per typical serving), squalamine (trace anti-angiogenic aminosterol), and various low-molecular-weight peptides with potential bioactivity. The calcium bioavailability is moderate — the hydroxyapatite form is generally considered to have comparable or slightly lower absorption than calcium carbonate (~25–35% absorption rate), though the protein matrix may modestly enhance uptake via peptide-mediated transport. Collagen-derived peptides (primarily proline- and hydroxyproline-rich sequences) may offer additional bioactivity. Contains no significant fat, fiber, or carbohydrate content. Negligible vitamin content. Note: as a marine-derived product, trace levels of heavy metals (mercury, cadmium, arsenic, lead) may be present depending on source species and processing; quality-controlled products should test below regulatory thresholds. Mucopolysaccharides (GAGs) may support joint and connective tissue health but oral bioavailability of intact GAG chains is limited, with most being partially degraded in the GI tract before absorption.

## Dosage & Preparation

No clinically studied dosage ranges have been established for shark cartilage calcium in humans. Processing yields vary with liquid extracts containing 2.0 mg calcium/100g and solid extracts containing 114 mg/g calcium, but standardized dosing protocols are not available. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Shark cartilage is generally tolerated at typical supplemental doses, but commonly reported side effects include nausea, vomiting, bloating, and hypercalcemia risk at high doses due to its significant calcium content. It is contraindicated during pregnancy and in individuals who have recently undergone surgery, as anti-angiogenic activity may impair wound healing and fetal vascular development. Potential interactions exist with calcium-channel blockers and anticoagulants, since high calcium intake can alter [vascular tone](/ingredients/condition/heart-health) regulation and chondroitin sulfate may potentiate warfarin's anticoagulant effect. Individuals with seafood or shellfish allergies should exercise caution due to potential cross-reactive marine-derived proteins.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses for shark cartilage calcium were identified in the available research. One source mentions that aqueous extracts and powdered preparations are under clinical investigation for antitumor potential, but study details including design, sample size, and outcomes remain unpublished.

## Historical & Cultural Context

No traditional or historical medicinal uses were documented in the available research. Modern interest in shark cartilage calcium emerged in the 1990s following processing patents for nutritional supplements targeting anti-tumor and immune effects.

## Synergistic Combinations

Vitamin D3, Magnesium, Vitamin K2, Phosphorus, Collagen

## Frequently Asked Questions

### Does shark cartilage actually cure or treat cancer?

No credible human clinical evidence supports shark cartilage as a cancer treatment. The most rigorous human trial of AE-941, a standardized shark cartilage extract, showed no survival benefit in 379 non-small cell lung cancer patients compared to placebo in a Phase III RCT. Regulatory bodies including the FDA have warned against cancer-treatment claims for shark cartilage products.

### What is the recommended dosage of shark cartilage supplement?

Clinical studies have used doses ranging from 500 mg to 4,500 mg per day, with some cancer-related trials using up to 1 g per kilogram of body weight daily of crude shark cartilage powder. No universally established therapeutic dose exists due to insufficient human trial data. At high doses, the calcium content in shark cartilage (approximately 15–20% by weight as hydroxyapatite) raises the risk of hypercalcemia.

### Is shark cartilage good for joint pain and arthritis?

The chondroitin sulfate content in shark cartilage is theorized to support joint health by inhibiting cartilage-degrading enzymes such as matrix metalloproteinases (MMPs) and reducing synovial inflammation via NF-κB suppression. Small open-label studies in osteoarthritis patients reported self-reported pain reduction, but these lacked placebo controls. The evidence is currently insufficient to recommend shark cartilage over better-studied joint supplements like glucosamine-chondroitin formulations.

### Are there any serious side effects of taking shark cartilage?

High-dose shark cartilage supplementation carries a risk of hypercalcemia due to its hydroxyapatite calcium content, with symptoms including fatigue, confusion, kidney stones, and cardiac arrhythmias. Gastrointestinal side effects such as nausea, diarrhea, and abdominal cramping are the most frequently self-reported adverse effects in human studies. Its anti-angiogenic properties also raise theoretical concerns about impaired wound healing and cardiovascular blood vessel maintenance with long-term use.

### What is the active compound in shark cartilage that inhibits angiogenesis?

The primary anti-angiogenic proteins identified in shark cartilage are sphyrnastatin-1 and sphyrnastatin-2, isolated from hammerhead shark (Sphyrna lewini) cartilage, which competitively inhibit VEGF receptor binding and suppress endothelial cell tube formation in vitro. The standardized extract AE-941 (Neovastat) also contains additional low-molecular-weight proteins shown to inhibit MMP-2 and MMP-9, enzymes critical for basement membrane degradation during new blood vessel formation. These mechanisms are well-characterized in preclinical models but have not produced equivalent effects in human pharmacokinetic conditions.

### Is shark cartilage safe to take during pregnancy or while breastfeeding?

There is insufficient clinical data on shark cartilage safety during pregnancy and lactation, so it should be avoided as a precautionary measure during these periods. Pregnant and breastfeeding women should consult their healthcare provider before using any shark cartilage supplement. The potential anti-angiogenic properties, while studied for tumor inhibition, raise theoretical concerns about fetal development and warrant professional medical guidance.

### Does shark cartilage interact with blood thinners or anticoagulant medications?

Limited clinical data exists on specific drug interactions between shark cartilage and anticoagulants, though some preliminary research suggests potential anti-inflammatory and blood-modulating effects. Individuals taking warfarin, aspirin, or other blood-thinning medications should consult their healthcare provider before supplementing with shark cartilage. This precaution is particularly important given the ingredient's preliminary evidence for anti-inflammatory activity, which could theoretically potentiate anticoagulant effects.

### How does shark cartilage calcium compare to bovine cartilage or plant-based cartilage alternatives?

Shark cartilage is primarily studied for its anti-angiogenic glycosaminoglycans and proteins, while bovine cartilage supplements typically focus on collagen and chondroitin for joint support with more human clinical evidence. Plant-based alternatives like green-lipped mussel contain similar joint-support compounds but lack the specific anti-angiogenic fractions unique to shark cartilage shown in animal studies. Evidence quality for shark cartilage remains preliminary compared to more established joint supplements, making direct efficacy comparisons difficult without human clinical trials.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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