One Nutrition - Ocean Mag (100g). Feel ship shape.. Our natural Atlantic sea sourced magnesium helps support normal muscle function and energy. Filtered from clean, Irish seawater, this highly alkaline powder also contains 72 other nutrients and trace minerals.. Ingredients:. Pure Magnesium Hydroxide, no fillers/ 35000mg Magnesium Hydroxide per 100g. 438mg per ¼ Teaspoon =177% RI