For people in their 90 s, many organs have shrunk and degenerated, so it is not recommended to use health care products. Instead, it is suggested to supplement nutrition through diet, eat more processed beans, such as soybean milk and tofu, eat more digestible and high-protein foods, such as yogurt and pure milk, and supplement the number of meals, such as 4-5 times a day, which is the healthiest. Maybe my answer is not what you want, but as a biological person, I still advise you not to trust health care products. If you must buy something for grandma, order her milk. If kidney is not good, health care products are a burden to the elderly.