glycine propionyl-l-carnitine acetyl-l-carnitine 1000g (2.2lbs) 100% PURE PROPIONYL L-CARNITINE (GPLC) Powder nonGMO USA VitaMonk GlycoTrax - High Absorption
Description
Regulation of pyruvate dehydrogenase (PDH) activity in human skeletal muscle during exercise

That doesnt mean its just for older people (far from it), but it explains why it appears in supplements found in homes with seniors who focus on daily well-being with a practical approach
The proportion of BMAd innervation increased toward the distal end of the tibia, with around 14% to 24% of cBMAds residing within 5 m of a TH + nerve (525)

(2011): L-carnitine--metabolic functions and meaning in humans life

[DOI] [PMC free article] [PubMed] [Google Scholar] 256.Pinkosky SL, Newton Rs, Day EA, Ford RJ, Lhotak S, Austin RC, Birch CM, Smith BK, Filippov S, Groot PHE, Steinberg GR, Lalwani ND

Acta Med Acad
