A lot of people are unable to sustain a regular intake of vitamin B12 throughout their life, and sometimes they may have to resort to taking vitamin b12 supplements in order to prevent developing vitamin b12 deficiency. Often though, improper use of these supplements can lead to an overdose, which can bring about significant vitamin b12 side effects.
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Vitamin A is required for T4-to-T3 conversion. If you find that lights are too bright or night driving is a problem, try taking Vitamin A supplements along with more protein. Zinc, selenium, and magnesium are also involved in T4-to-T3 conversion.