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Vitamin B1 (Thiamine): Helps convert carbohydrates and fats into energy

Lasting tiredness can have many causes beyond B12, such as iron levels, thyroid issues, or sleep problems, and a check-in helps make sure you are treating the right thing

Two other genetic studies revealed a positive association between ASD and other SNPs of MET in the same intron (intron 1), such as rs38845 in Caucasian population patients (Sousa et al., 2009) and rs38841 in Japanese population patients (Thanseem et al., 2010)

You can find genetic testing with various companies such as 23andme.com Its estimated that those with one mutation (heterozygous) decrease their ability to methylate by 30% and those with two mutations (homozygous) decrease their ability to methylate by 70%, making it virtually impossible to get adequate B12 from diet alone (19)