SN's job is to starve your blood of oxygen, so IN THEORY it would work, and it would also likely prevent puking. However I would not recommend it due to the fact that I can't find any good sources of what would happen if injected. However you would be able to get a lethal dose in since the solubility SN is 80g per 100ml at 20C. You would need aprox 35ml (i would go w 40 to be safe) of water mixed with 25g of SN. So I would say just drink it since, the average vaccine liquid you get injected with is 5ml~ and no offense I don't see anyone taking 8 times more in an injection in one quick hit. So just drink it and have a backup drink in case you puke.