Stimulating supplement

I have a wife who has practically always had little interest in sex (we are talking about NORMAL marital relationships without particular fantasies, excesses, demands, etc.). Now that she is 55 we are roughly or nearly under chastity. It is possible to “stimulate” my wife with a few drops or pills, but does it really have an effect? Perhaps it will also result in an occasional use of anxiolytics (after the first pregnancy she had postpartum depression that lasted until the second) before going to sleep but, I repeat, however, the use is not frequent. If it can be useful, she does not have diabetes, heart problems, gastritis, but only a declared, almost chronic, general exhaustion. Clearly I should give her drug / supplement to her without her knowledge because she thinks she is completely “normal” in this regard, despite the numbers being close to zero per year! Certainly I should have intervened earlier, but in recent years the situation has worsened even if, as soon as we got married, the interest was low despite the young age.