Personally, I prefer to buy supplements with as few extra added ingredients as possible.
For magnesium citrate I use Natural Calm Original, pure magnesium citrate powder and nothing else (the Original is not flavoured). You can start low and build up to the amount that suits you. I dissolve mine in a small amount of warm water then add orange juice, quite tasty.
I usually buy from Amazon but the price is a bit higher than normal at the moment, I expect stocks are low and the price may come down a bit when new stock arrives.
B12 I highly recommend the BetterYou sublingual spray. It’s methylcobalamin which is a good active form. If you find yourself sensitive to supplements just start with 1 spray per day (they recommend 4 sprays which = 1200mcg/day)
I recommend BetterYou for K2 too, as it’s also offered as a sublingual spray.
Any particular reason you need citrate? (Constipation relief?)
If you don’t need citrate and can consider other forms I can recommend other types
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