According to the landlord's account, grape seed is actually highly recommended by your father at his age. Grape seeds are hyped as beauty. In fact, their real function is to clarify the free radicals in the body, that is, to resist oxidation. Free radicals are called "the source of all diseases" in the medical field. Your father is 50 years old, he smokes a lot, and he is under great emotional pressure. All these reflect that there are many free radicals in your father's body, but now the grape seeds on the market are mixed, so you should compare and weigh more.

In addition, according to your account, your father's cardiovascular and cerebrovascular diseases are not very good, especially hypoxia. Grape seed should be very helpful to your father, but you must buy something of better quality and keep taking it.

Even if you take more supplements, a reasonable diet and proper exercise are the way to health!

I wish your father good health!