Problem processing vitamins B12 and D

I don't know who Lo Bosworth is, but she has recently experienced panic attacks and Depression due to vitamin B12 and vitamin D deficiency. Although my blood test results have shown that I was vitamin D deficient, it has never shown vitamin B12 deficiency. But why would it if I had this genetic condition that she found out she had. I don't know if her symptoms included chapped lips.

"Genetic testing revealed that her “body doesn’t process B12 and D in the way that other people can.” Tweet