The general advice is to use a broader needle (such as a green 21G) to draw up the B12 and then a slightly narrower one to inject (such as a blue 23G for the thigh muscle).
Personally, I found long needles (orange 25G or grey 27G in 40mm lengths) cause less soreness afterwards than a 23G.
Of course we should use whichever needle we find best but is there any reason not to propose such fine needles in general for most people?
What advantages of a 23G needle am I missing?
I agree , but it’s difficult to find the 25 , 27 or 30 gauge in a length suitable for I.M injections . I would buy them if I knew your source . B12 injections are admirably suited to fine needles because the solution is watery .
I echo that.
The finer needles are slightly more expensive but that wouldn't stop me buying them if I readily could.
Could you please let us know how to source those fine gauge dental injection needles ? I’ve tried on the internet without success . Thank-you .
Hi Wedgwood!
Just checking you got the excellent following reply! x
Thank you deniseinmilden. I hadn’t see it ! Excellent !
Hello Wedgewood and Denise, long thin needles are available from Exchange Supplies. They cost about double what Medisave usually charges for standard needles. The ones I have are Sterican brand made by BBraun who list them for dental anaesthesia.
Long orange 25 gauge 40mm (1½ inch) needle (£7.92 for 100) exchangesupplies.org/shopdi...
Long grey 27 gauge 40mm (1½ inch) needle (£6.60 for 100) exchangesupplies.org/shopdi...
Add £5 for delivery.
Several sellers on eBay also list these but I am not so confident of shopping on eBay. Other medical suppliers (Medistock, GPsupplies, MedicalBox, etc) list the 27G but not the 25G.
Thank you!
Due to order again soon so perfect timing too!
Best wishes to you! Denise
I did it! I self injected under the eye of the nurse...but need some needle help.
SI B12 - needle size?
b12 vials multiuse 
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