6-Methylheptanoic acid (6-methyl-heptanoic acid) is orally toxic and is involved in the synthesis of polymyxin B and colistin hapten PMB-A.

6-Methylheptanoic acid 是一种在 Pelargonium graveolens、Solanum pennellii和 Staphisagria macrosperma 中发现的中链脂肪酸。