It is difficult to assess the safety of vasoconstrictors in pregnancy because they are usually available in combination products
They are among the best non-dairy sources of calcium, providing more milligrams of calcium per serving than any other nut, and are also high in vitamin E and protein
However, with severe vitamin B12 deficiency or absorption issues, healthcare professionals may recommend an intramuscular injection rather than an oral supplement
As described in section V.B.5.c.(6)
PMID: 29688261 Bahri Khomami M, et al
B Complex Vitamin B Complex is composed of eight B vitamins including B1 (Thiamine), B2 (Riboflavin), B3 (Niacin), B5 (Pantothenic), B6 (Pyridoxine), B7 (Biotin), B9 (Folic Acid), and B12 (Cobalamin)