I should have also said: look up people on YT who talk about their b12 deficiencies. That helped me a lot.

So did this product:

"Ancestral Supplements Grass Fed Beef Liver (Desiccated)"

Sublinguals helped for the major deficiency but now I maintain by eating encapsulated liver and spleen and cow blood.

That company also makes a spleen/liver/cow blood blend or you can just go straight liver. No taste.