B1, B.I, B.1 or B-1 may refer to:
== Biology and chemistry == Bradykinin receptor B1, a human protein Cinnamtannin B1, a condensed tannin found in cinnamon Combretastatin B-1, a stilbenoid found in Combretum sp. Fumonisin B1, a toxins produced by several species of Fusarium molds B-1 cell, a lymphocyte type Arecatannin B1, a tannin found in the betel nut Proanthocyanidin B1, a B type proanthocyanidin Vitamin B1, also known as thiamine
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).