I haven't heard much about Yusuf, but spirulina has an auxiliary treatment effect on atrophic gastritis. You can check it online. It is best to buy famous brands of spirulina. You can rest assured that patients with atrophic gastritis have reduced gastric acid secretion, upper abdominal discomfort, indigestion, and even emaciation and anemia. Taking Spirulina platensis: (1) The dietary fiber contained in Spirulina platensis can establish beneficial lactic acid bacteria in the intestine, effectively improve the intestinal immune function, and its rich chlorophyll, phycocyanin, β-carotene and other substances have the functions of resisting mucosal inflammation, repairing cell damage and restoring normal gastric secretion. (2) Spirulina can balance nutrition and improve immunity. Contains VB 12, VB6, folic acid, organic iron and phycocyanin, which can stimulate bone marrow hematopoiesis and prevent and correct pelvic blood. (3) Although spirulina is alkaline, it will not affect the secretion of gastric acid if patients with atrophic gastritis take it after meals.