the saw palmetto will be a mixed blessing. it barely does anything at all, n what it does is inhibit 5-alpha-reductase. that enzyme is what cleaves the testosterone molecule (the primary male sex hormone in ur muscles) into DHT (the primary male sex hormone in the rest of ur body, including ur genitals, voice, skin, hair etc)...so when u have less DHT, ur sex drive and sexual potency will go DOWN. further, an increase in pure testosterone u gain as a result will also increase the amount of testosterone being cleaved into estradiol (the primary female sex hormonee in all men, and in women b4 menopause) by the aromatase enzyme, which will only further subtract from ur male potency.
horny goat weed is good, tribulus is bullshit...u'll get a better and more reliable boost in ur luteinizing hormone (LH) (and thus ur testosterone n DHT) from regular long sessions of sex or masturbation. work it, baby!
the ginseng has shown mixed results relative to sexual issues, n ginko is mostly theoretical...i can never digest it tho, i burp ginko for 8 hours after a single capsule. arginine can be useful as well, just dont bother taking it b4 a workout, that theory has been debunked.
yohimbe can also be helpful, but as a stimulant it can be jittery and dangerous to ur health. do ur research n know VERY well what the state of ur own health is b4 u play with that herb in effective doses...it can be unforgiving.