The conclusions drawn here are a stretch. Urine is where you find waste products, and what is in your urine isn't likely to be also in your brain, or at doses that are anywhere similar. You kidneys and bladder are in the business of dealing with waste, your brain is not. My guess is that most components in urine aren't going to be good for rats if injected into their eyes as in the study cited. DMSO is not good for you, but that doesn't mean that asparagus is bad for you. There are actually a few compounds in asparagus that have anti-cancer properties, some of which are actively being investigated. Dose and context is everything. Aspirin is an anti-inflammatory at low doses, but can increase risk of hemmoragic stroke and GI bleeding at higher doses. Physiology is far more complicated than this blog post suggests. Toxicity is not defined as 'yes' or 'no'. There is much evidence that a 4-5 beers or glasses of wine per week are good for you, but there is also plenty of evidence that 4-5 beers or glasses of wine per day are not.
I agree that the thinner ones are better grilled. They crisp up nicely. A few weeks back I was being given a tour of an organic farm. He had wild asparagus growing everywhere. He suggested I just pick a spear and eat one. I did and it was delicious. I love asparagus. I particularly like pickled asparagus in a Bloody Mary. -or a Caesar. Ftfy forwardslash