Amongst many other things, my B-Complex is loaded with

B1 100mg
B2 100mg
B3 100mg
B5 100mg
B6 100mg
B12 500ug

I've also had a full thyroid and pituitary function check done recently (still awaiting pituitary) but my thyroid tests returned a B12 level of 544 picomoles/litre (based on lab references where Deficient <140, Insufficient 140-250 and Consider Reducing Dose >725), so I have currently have pretty healthy levels.