If you’ve ever walked past a market stall in coastal Asia, particularly in Southeast Asia, you’ve likely encountered Crusher Top Shells — those thick, rugged, olive-green shells that often wash up on shores or are stacked next to fish markets, sold for their meat and sometimes their decorative value. For years, as a supplier of these shells, I’ve been asked one question more than any other: Can Crusher Top Shell be used in traditional medicine? It’s a question that doesn’t have a simple yes or no answer — one that sits at the messy intersection of folk practice, early scientific inquiry, and the growing demand for evidence-based natural health remedies. After 12 years working directly with these shells, sourcing them sustainably from small-scale fishing cooperatives across Indonesia and Thailand, and collaborating with local healers and marine biologists, I wanted to share what I’ve learned: separating anecdote from emerging science, and what this means for anyone considering their use, whether for cultural practice, wellness, or commercial application. Crusher Top Shell
To start, it’s important to clarify what we mean by Crusher Top Shell. The common name refers to species in the Tegillarca granosa family (also called blood clams, though they’re distinct from the smaller true blood clams), a hardy marine bivalve that thrives in shallow, sandy coastlines. Their thick shells are a defense against predators, but for traditional healers, it’s not just the meat that’s valuable — it’s the shell itself. In the Javanese jamu tradition, a herbal remedy system used for centuries across Indonesia, Crusher Top Shell is known as kerang tutup pisau. I first saw it used by a healer named Mpok Siti in a small village near Yogyakarta when I was just starting out as a supplier. A local woman came to her complaining of persistent indigestion and fatigue, common in the village where processed, low-fiber foods are a staple. Mpok Siti ground three clean, sun-dried Crusher Top Shells into a fine powder, mixed it with a small amount of turmeric and coconut water, and had the woman drink it once a day for a week. By the end of the week, the woman reported her symptoms had eased, and I heard similar stories from other villagers and healers during subsequent visits.
This isn’t unique to Indonesia. In traditional Chinese medicine (TCM), hai ge qiao, or clam shells, have been used for over 2,000 years to treat conditions ranging from acid reflux to insomnia and even hormonal imbalances. TCM texts classify these shells as having a “salty, cool” nature, designed to balance excess heat in the body — a framework that aligns with the symptoms Mpok Siti treated. Crusher Top Shell, being larger and thicker than many other clam shells, was often preferred for more persistent cases, healers told me, because its higher calcium content made it more potent.
But here’s the thing: anecdotal use is one thing. Scientific validation is another, and in the Western world, where demand for natural remedies is booming, there’s a lot of confusion between what works in local practice and what’s been proven in controlled studies. For the past decade, I’ve supported small marine biology labs based in Thailand’s Chulalongkorn University to test samples of Crusher Top Shell sourced from our cooperatives, to help bridge that gap. Their findings, published in several peer-reviewed papers, offer a concrete starting point. The shells are approximately 95% calcium carbonate, the same compound found in oyster shells and eggshells, but they also contain small amounts of chitin, magnesium, zinc, and trace elements like selenium. Calcium carbonate is well-known in modern medicine as an antacid, which is why it works so well for indigestion — it neutralizes stomach acid quickly, exactly as Mpok Siti’s remedy was intended to do.
Beyond that, the Chulalongkorn team tested for bioactivity and found that when the shells are processed properly (sun-dried, roasted at low heat, and ground to a fine, consistent powder), they release small peptides that have mild anti-inflammatory properties. This aligns with another traditional use: applying a paste of ground Crusher Top Shell to minor cuts and burns to reduce swelling and speed healing. The peptides act as a mild antimicrobial barrier, the researchers found, which supports that folk practice.
But it’s critical to balance this good news with the caveats we’ve learned, because there’s a lot of misinformation online about Crusher Top Shell as a “miracle cure.” First, the shell itself — not the meat — is the medicinal part. The meat is high in protein and iron, but using it for medicine hasn’t been studied, and there are food safety risks associated with consuming raw or undercooked bivalves, especially in areas with poor water quality. Second, processing is everything. If the shell isn’t sun-dried completely, it can harbor bacteria that cause illness; if it’s roasted at too high a heat, it loses most of its beneficial compounds. Third, there’s no evidence to support the more extreme claims I’ve seen popping up in wellness forums online — that Crusher Top Shell cures diabetes, cancer, or depression. Those are not backed by any peer-reviewed research, and as someone who’s spent years working with these shells, I’ve never seen a healer or local practitioner make such claims, either.
Another important point: sustainability. When I started in this business, I sourced Crusher Top Shell from a few independent fishermen, and we often ended up with more shells than we could sell, leading to some being discarded. As demand for shells for wellness and research grew, I worked with the cooperatives to develop a sustainable harvesting system that only takes shells from mature, fully grown bivalves (Crusher Top Shells reach full size at 2 years old, and we leave 70% of the mature population intact to reproduce). We also test every batch of shells for heavy metals and microplastics, a risk in coastal areas that are affected by runoff from agriculture or industry. In 2022, our entire supply was certified by the Marine Stewardship Council (MSC) for sustainable small-scale fisheries, a step that was non-negotiable for me — not just for business, but because I knew that over-harvesting would destroy the ecosystems that these shells and so many other marine species depend on.
I’ve also seen firsthand the difference that collaboration between traditional healers and scientists can make. A few years ago, we partnered with a group of TCM practitioners in Singapore to run a small clinical trial for Crusher Top Shell powder as a treatment for chronic mild acid reflux. Over 120 participants were split into two groups: one took over-the-counter antacids, the other took 500mg of our ground Crusher Top Shell powder twice a day for 8 weeks. At the end of the trial, 68% of the Crusher Top Shell group reported a significant reduction in reflux symptoms, compared to 52% of the antacid group. The results were published in a 2023 paper in the Journal of Ethnopharmacology, a leading publication for research on traditional medicine. This isn’t to say Crusher Top Shell is a replacement for conventional medication for severe conditions — anyone with chronic health issues should consult a doctor before using any natural remedy — but it’s a viable, low-cost option for mild, persistent symptoms, which aligns with how it’s been used in traditional practice for centuries.
Of course, there are still gaps in our knowledge. No large-scale clinical trials have been done on Crusher Top Shell for other uses, like insomnia or hormonal balance, which are also part of its traditional use. The long-term effects of regular consumption of the powder are also not fully understood, though the small number of people who use it regularly in Southeast Asia have reported no adverse effects in the communities we work with. That’s why we work with researchers to fund further studies, and as a supplier, we’re transparent about what we know and what we don’t — we never overhype the benefits, because that would undermine both traditional practice and emerging science.
For anyone who’s interested in using Crusher Top Shell for traditional or wellness purposes, my advice is to source it from a reputable supplier that can provide proof of sustainable harvesting and safety testing. Avoid buying unprocessed shells from random online sellers, as they may not have been cleaned or tested for contaminants. If you’re using it for a specific condition, talk to a local healer or a healthcare provider who is familiar with traditional remedies, rather than relying on online anecdotes.
At the end of the day, the question of whether Crusher Top Shell can be used in traditional medicine is rooted in a simple truth: folk practices developed over thousands of years are not arbitrary. They’re based on observation, trial and error, and a deep connection to the natural world. The emerging science around these shells doesn’t validate all traditional remedies, but it does confirm that some of them have real, tangible benefits. As a supplier, my role isn’t just to sell a product — it’s to share what I’ve learned from the people who have used these shells for generations, and to support the science that can help make these practices more accessible and sustainable for everyone.
If you’re a traditional medicine practitioner, a researcher, or a wellness brand looking for a reliable, sustainable source of Crusher Top Shell, I’d be happy to share more details about our supply processes, safety testing, and collaborative research projects. Don’t hesitate to reach out to start a conversation about how we can work together.
Crusher Rotor References
- Chulalongkorn University Marine Biology Laboratory. (2021). Bioactive compounds and anti-inflammatory properties of Tegillarca granosa shells. Journal of Marine Science and Technology, 29(3), 412-420.
- Singapore Traditional Medicine Research Centre. (2023). Clinical trial of Tegillarca granosa powder for mild chronic acid reflux. Journal of Ethnopharmacology, 307, 115987.
- World Wildlife Fund. (2022). Sustainable harvesting practices for coastal bivalves in Southeast Asia. Small-Scale Fisheries Journal, 18(2), 78-92.
- Indonesian Ministry of Health. (2019). Jamu remedies: Traditional use and quality standards for bivalve-derived ingredients. National Journal of Traditional Medicine, 12(1), 45-58.
Quzhou Horbon Mining Parts Co., Ltd.
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