hai, As your brother got kidney related problem(renal failure )will not allow him to take some foodstuffs like potassium rich vegetables and fruits and high protein content. 50 to 10 gm of simple protein diet will be allowed(depends on renal function amount differs.). As complex protein like chicken,sea foods will lead to increase in urea and creatinine level that will damage the kidney function. less potassium containing fruits and vegetables allowed. Herbs like punarnava(Boerhavia diffusa),corn silk,asparagus,tribulus, phyllanthus niruri are effective in kidney failure. Certain herbal combination powder with above mention herbs will be available in market. kindly consult a Ayurvedic specialist for further management. thank you Hope i answered your query.