Oyster shell powder, oyster shell calcium powder, oyster shell, borei Please let us know before purchasing if you are a repeat customer. 150 grams is approximately 170ml. We have plenty in stock. If you need more than 150g, please comment before purchasing. We will add 30 yen for every 50 grams increase. We offer discounts depending on the quantity, so please inquire. We are also selling on Yahoo Flea Market. We also sell by grain size. We can also provide samples of coarse and fine grades as a trial, so please comment if you need them. The shells are sterilized by heating and drying at around 500 degrees Celsius after washing away the salt. The main component of oyster shells is calcium carbonate. For calcium supplementation for humans, small animals, birds, reptiles, and amphibians. For dusting and gut loading of insects for food. For adjusting the acidity of horticultural soil. At home, I mix it with tea or coffee, and use it for dusting dubia roaches (Argentine cockroaches) and mixing it into the paste food for toads. Ingredients: Oyster shells (made in Miyagi Prefecture) Alkaline content: 50.0% Nitrogen: 0.2% Phosphorus: 0.15% Potassium: 0.03% Calcium: 94.8% Magnesium: 0.40% Silica: 3.09% Also contains trace amounts of manganese, boron, zinc, copper, iron, molybdenum, etc. Shipped via Yu-Packet Post Mini. When used as food for humans or living creatures, there is no expiration date or best-before date for oyster shells, but please use them within 2 years of opening as a precaution.