So 10 days after abstaining from kava my LFT is normal. The exact numbers are AST: 43 / ALT: 47. This means a few things if anyone is interested:
1) Properly grown, fresh noble kava can increase liver enzymes such as ALT to 1.5-2x the normal if you drink 5-8tbsp/day like I did, but it depends on the person.
2) It can have this effect on your liver regardless of your age, health, eating habits, weight, supplements, exercise. I'm 31, eat healthy, work out, normal weight, take Milk Thistle and other liver supplements, don't drink alcohol at all, no Tylenol, and so forth.
3) It isn't permanent liver damage of any huge significance, at least in my case. If my results went back to normal after 10 days of abstaining then I probably didn't have fatty liver or anything.
4) You can still feel it though. Even if kava doesn't cause long-term damage (it may or may not), you will still experience fatigue and general signs of liver stress. This is for people who have the same genetics or whatever conditional factors that I have. So drinking kava might not be worth it for these people, even if you ignore your LFTs.
5) For many people they won't feel any of these effects, or have any liver issues.
So I'm not out there to worry kava drinkers but I would just get your LFTs done periodically. Plenty of people like Deleted User01 got theirs done with no negative results at all.