That's what most do with ketamine to reduce chance of infection . U could also buy a reagent to test it before use .

Only issue I see with intranasal is that bioavailability is only 33%

Are you saying that buying a black market substance and injecting it would be the safer option?

No, I'd suggest using a clinic.

If you read my comment. I'm suggesting that you don't inject ketamine and instead you should snort it. I'm not suggesting that snorting black market ketamine is safer than a clinic.

Though, ketamine is pretty damn safe, and it's rarely adulterated on the black market. In powder form, it forms crystals so it's hard to fake.

A priori, you can always say that something regulated is more safe than something not. But if you're a savvy consumer, you can significantly mitigate or eliminate that risk.

Ketamine is heavily cut on the black market, both in crystal form and not.

What is harder to fake it vial ketamine. There is a significant cost to that.

Exactly. Street ketamine powder is often heavily cut. If I had to buy illegally for some reason, I would only consider buying sealed vials, and I'd probably still have them tested. My ketamine doctor has worked with patients who used to buy on the street, and they brought in "ketamine" that was the wrong color, had flecks of different colors in it, etc.

So in this case this has nothing to do with treating suicidal ideation and instead strictly for recreational consumption?

I'm not sure what point you are trying to make. I didn't say anything about doing it for recreational consumption.

I'm suggesting that if you can't afford a Ketamine clinic: a) Ketamine is generally unadulterated on the black market b) if it is adulterated you can often tell c) unless a professional is administering it, you probably want to snort it and finally d) snorting Ketamine should have roughly the same effects (anti-depressant or otherwise) as injecting it.

Are you arguing in good faith? The proposal is to buy ketamine online and snort it IF you cannot afford to do it in a clinic because (1) ketamine as a pure drug is pretty safe if you don't use it routinely (2) snorting is safer than IV. The topic is still to use ketamine against suicidal ideation. This has been repeated to you twice, please try reading better before arguing with people.