They use to sell b12 in pink powder form at polbeth whippet track (Livingston) ,,,me basically I wasn't into that shit although it wasn't illegal in racing,,iam a great believer in not putting stuff down a dogs throat I.e fancy tablets or drinks or powder,,,as u find they have kidney problems later on
The things I learnt as a simple kennel lad in 80s I wouldn't apply today,but had to then
Best feed best u can ,,,keep them fitt as u can and that's the best u can do...no fancy gimmicks