Oyster Shell Powder, Kaki-gara, Calcium Powder, Borei-ko, Oyster, Borei If you are a repeat customer, please let me know before or after your purchase. I am also selling the same item on Yahoo Flea Market. 150 grams is approximately 170ml. I have plenty of stock. If you need more than 150g, please comment before purchasing. We will add 30 yen for every 50 grams increase. Please inquire for discount prices depending on the quantity. I also sell by grain size. Also, as a trial, I can include samples of coarse or fine grains, so please comment if you need them. After washing away the salt, it is heated and dried at around 500 degrees Celsius to sterilize it. 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 insect feed. 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 (Miyagi Prefecture) Alkaline content: 50.0% Nitrogen: 0.2% Phosphoric acid: 0.15% Potassium: 0.03% Calcium: 94.8% Magnesium: 0.40% Silica: 3.09% In addition, it 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 it within 2 years from opening as a precaution.