butyric acid is found in butter, as an hexyl ester in the oil of Heracleum giganteum (cow parsnip) and as an octyl ester in parsnip (Pastinaca sativa); it has also been noticed in the fluids of the flesh and in perspire.

Calcium Butyrate Specifications:

Product:: Calcium Butyrate.
CAS #: 5743-36-2.
EINECS Number: 227-265-7
Synonyms: Butyric acid calcium salt; Calcium dibutyrate; Butanoic acid calcium salt; Dibutyric acid calcium salt; Bisbutanoic acid calcium salt.
Molecular Formula: C8H14O4Ca.
Molecular Weight: 214.28
Odor: Characteristic rancid, sour milky odour.
Description: White to off white fluffy hygroscopic powder. It has Sour Milky Odour, Stable to Light and Heat, Freely Soluble in Water.
Moisture Content: 0.5% max.
Loss on Drying: 0.5% max.
pH: Alkaline.
Assay:  98.0% min. (by GC).
Heavy Metals: ≤ 10 ppm
Lead: ≤ 3 ppm
Arsenic: ≤ 3 ppm