Is it ok to take l-arginine vitamins and folate (folic acid) to improve erections if i have hbp, controlled by meds and with stage 3 kidney disease?

Go ahead: They are unlikely to do you any good or any harm. Both are normal components found in most everything that you eat.

Arginine: Arginine is a nitrous oxide liberator and this may help; doses that have been shown to help are 3-4 grams; it is not harmful; coreg (carvedilol) and clonodine, though, may diminish erectile ability

Here are some ...: L-Arginine is commonly included in many brands of supplements touted for enhancing erection, which usually have Yohimbine - the chief ingredient for helping erection through central nerve effect. In reality, l-arginine effect for erection is still not clearly defined. Note the cause for ED is always multiple and no single agent can boot but potentially help improve erection depending on existing..