(Second on my list would be vitamin D, but its much harder to develop low vitamin D levels if you take a daily supplement, as I explain in this post
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Research shows that methylcobalamin has higher retention in the body compared to cyanocobalamin
You can add fortified foods to your diet or take supplements to meet this need
Supplementation strategies vary depending on the underlying cause of deficiency or risk factors: Oral supplements (typically 25-2000 micrograms daily) are suitable for individuals with adequate intrinsic factor production but insufficient dietary intake Sublingual or buccal preparations have no proven superiority over standard oral tablets at equivalent doses Intramuscular injections (usually 1000 micrograms of hydroxocobalamin) are the preferred treatment for pernicious anaemia and severe malabsorption
If you are using oral capsules, none of the above applies you only need the capsules themselves