Darkened or colored urine isn't always a sign of liver stress. LOTS of compounds will turn the urine color that have no effect on liver function (vitamins; some of which can turn the urine orange), while other compounds are significantly liver toxic and cause little to no discoloration of the urine (Tylenol).
S23 is not methylated and has MINIMAL impact on the liver. Before any starts claiming that a non-methylated SARM is significantly liver toxic, please brandish some research (it doesn't exist) showing this is the case, or at least get some blood work. However, before getting blood work make sure you take at least a week off training, as training itself will increase liver enzymes (potentially very significantly; well outside the normal range) for a whole week after training. There's plenty if research to prove that.
Also, keep in mind that almost EVERY compound is inherently liver toxic to some degree, including testosterone, food related metabolites, etc. Even things we consider completely benign (to the liver) can cause some degree of liver stress when utilized/consumed to excess. So, if someone is using 5X the recommend dose of a SARM, there may be some increase in liver enzymes. However, they will still be far lower than what one would experience with known, toxic compounds, such as methylated AAS.
Besides, the liver is NOT what I would be concerned with. How many people do you know who are dying from liver failure...or experiencing serious, long-term negative health effects from from liver toxic compounds like oral AAS? No one. This is because the liver regenerates. It's JOB is to process toxins. Simply having elevated liver enzymes is NOT a sign of liver damage. It is a sign that your liver is doing its job--processing the toxins in your bloodstream.
I would be MUCH more concerned with the cardiovascular system than the liver...because the cardiovascular system does NOT repair itself like the liver does. It does and will to some degree, but long-term damage can and often is done to steroid users...especially those who use methylated AAS regularly. Methylated AAS are WAY, WAY worse on the cardiovascular system than SARMs.
Anyone who thinks that switching to oral AAS isn't going to be any worse for their health than taking SARMs better think again. I see way too much emphasis on liver heath around here in comparison to the organ system that really matters--the cardiovascular system. Protect THAT!
Now, I am NOT saying the liver isn't important. Of course it is. What I am saying is that 99% of people won't experience any serious, long-term liver issues from PED's, regardless of whether they use liver care products or not.
But...anyone who uses AAS long-term, especially methylated drugs, certainly will experience cardiovascular problems--problems that matter.