First, if you're concerned about Sapphire having diabetic neuropathy, you want a particular form of B12 -- methylcobalamin or methyl-B12. The general form of B12 is cyanocobalamin.
I do have one favor to ask. Could you please use our spreadsheet? Most of the members here are in the US. If you're outside of the US, you're measuring blood glucose in mmol/L whereas in the US we measure in mg/dL. Our version of the spreadsheet has a tab for those members who are outside of the US and it automatically converts your readings to US measures and puts that information on a separate tab on your spreadsheet so we don't have to manually convert your readings. The link to the spreadsheet template is in
this post.
Regarding the depot, when first starting out, it takes 5-7 days for the depot to stabilize. Any subsequent change in dose needs 3 days for the depot to adjust. So if you increase or decrease the dose, you may not see a change immediately. In addition, things like a bounce can take a few cycles to clear. I'm not sure how experienced the person was who was giving you advice on the FB group but that's not the way the dosing methods are written. Reducing the dose to try to prevent a bounce only ends up keeping your cat in higher numbers longer. You do not reduce the dose unless your cat drops into a range indicating that the reduction is warranted. If you are following TR, that would be dropping below 50. If you're using SLGS, the dose reduction point is 90. A cat dropping into blue numbers, bouncing, and coming back into the blues does not get a dose reduction.
The other issue to factor is that Lantus likes consistency. The depot does not like it if you make back-to-back dose changes. You generally wind up with wonky numbers.
If you've not already done so, I'd encourage you to read over the sticky notes at the top of the
Lantus board. There's a discussion of the depot in one of the posts. There's also a post on dosing methods. Your signature doesn't specify which approach you're using and it will help us to know how you're dosing so we can offer better informed guidance.
Also, one reminder. Be kind to yourself. You've been managing Sapphire's diabetes for less than 2 weeks. If someone hasn't said this already, your dedication and caring is very apparent. The other thing someone has likely said is that managing your cat's diabetes is a marathon, not a sprint. It takes time. And right now, I have no doubt that you're feeling more than a little overwhelmed. There's a lot to absorb. It will get easier and you and Sapphire will find your routine.