Last night I was a little bored so I broke in to my stash and decided to pin some 500 mg/ml test E.
As with most high mg gear it contained guaiacol as a solvent used to create that level of concentrate. We see it's use all the time especially in TNE. You've probably had it if you have noticed that stink and unmistakeable taste in your mouth.
After pinning, I kind of felt a little shitty. It wasn't my first rodeo with guiacol so I knew what to expect.
At any rate I sat down and decided to do a little study on guaiacol and my suspicions were correct...that shit is toxic.
"What are you talking about Ed? My boy wouldnt brew something toxic? He's the best source in the world!"
Well kids I hate to break it to you but your boy is likely a 25 year old kid brewing shit up with recipes he found on the Internet And you just payed him 50 bucks for 5 bucks worth of material he doesn't give a shit about the toxicity of your TNE.
So I suggest taking time to study shit out in all things.
At any rate from what I have read guaiacol will kill a man if he ingests 50 mg/kg. just to put that in perspective if you are a 155 lb. adult 3.5 grams of guaiacol will kill you. But that's the kicker, that is the dose of ingested not injected so I am of the belief that it's much more toxic through injection.
Ever inject Winny as opposed to taking it orally? That's right kids the injections are much stronger.
"what is your point Ed?"
Well kids my point is this, sure your intake of guaiacol isn't on the toxic level or you would be dead, however if you are pinning TNE every day and high mg gear on top of that it might be a good idea to check yourself before you wreck yourself. You are likely pinning a little bit of poison every day, and it may likely be the reason you are feeling like shit.
I see a lot of people on here saying that they are allergic to guaiacol. I don't think that's the case, I just think that they are sensitive to the metered dose of poison that they are putting in to their body. That shit can't be good can it?

Just my two cents. If you are a little concerned, I would suggest talking to your source and finding out him much guaiacol he or she might be using as a solvent.
To me, any poison is bad poison that's why they call it poison.

All my love, no homo
Ed.

P.s. I'd site my sources but I'm too lazy today. Google that shit and you'll see that I'm right. Also on a side note, a lot of e-cig oils contain guaiacol as well, so if you smoke E-cigs, pin TNE, and inject high mg gear you might be killing yourself faster than you think.

Be safe my friends.