Vitamin B1 (Thiamin) Important for energy metabolism, cellular function, and a wide variety of organ functions. Sources include organ meat, pork, seeds, squash, fish (especially trout, mackerel, salmon, and tuna), and legumes. Wiki Category: Nutrients FacebookTweetPinLinkedIn About Claire Wiseman Previous Post:Vitamin A (Retinol) Next Post:Vitamin B2 (Riboflavin)