B-complex I remember the word "békomplex" very well from my childhood, but I never really knew what it meant. Younger people probably associate this word with drum & bass, because the name B-Complex is used by Slovak DJ and producer Matúš Lenický (hit Beautiful Lies). Strictly speaking, B complex is a group of vitamins B1 to B12 . And it is one of the oldest vitamins discovered. B7 (biotin) was discovered as early as 1898 by F.Steinitz. But the B vitamin group was only discovered in 1911 by Casimir Funk. We mention it mainly because this scientist introduced the word "vitamin" that we use so often. Gradually, other B vitamins were discovered, which today are referred to by the common name: B-complex. B1 - thiamine (or also aneurin), is water soluble and heat sensitive. It maintains oxygen levels in the blood and is important for the metabolism of sugars. It is found in yeast, paddy rice, legumes, cheese. Its deficiency is manifested by muscle pain, fatigue, lack of appetite... B2 - riboflavin is not heat sensitive, but cannot tolerate light,