I think I read somewhere that this is a less painful injection??
I also think it might work better for the person who needs it as they've shown as having a gene mutation that means they can't process B12 as well, plus they need more than normal to stay well. We've hit a brick wall with doctors & as I already SI myself it makes sense. Also needles, I use needles I get from the drug exchange, which are nice and fine, but I wonder if you can buy even finer, less painful ones
The person this is for is very pain sensitive, so looking to SI as pain free as possible