My daughter had recent blood tests that showed her B12 at 1200 ( range 191 - 663). This was also at this level 2 years ago. She has not been taking Vit B supplements.
She has Down's Syndrome and also has Hashimoto's Thyroiditis.
I would be grateful for any help or advice. Her GP is unconcerned but has been so about TSH in double figures, so no surprise there.