What are the functions of vitamin B1 (thiamin)?
1) coenzyme; assists in glucose, fat, and protein metabolism, amino-acid synthesis
2) coenzyme; amino acid synthesis; RNA, DNA, and red blood cell synthesis
3) coenzyme; assists in glucose, fat, and protein metabolism, cholesterol and neurotransmitter synthesis
4) coenzyme; assists in glucose metabolism, RNA, DNA, and ATP synthesis