the most bioavailable acetyl l carnitine Acetyl-L-Carnitine Momentous Acetyl L-Carnitine - Brain
Description
2003, doi: 10.1519/1533-4287(2003)017 2.0.co;2

There remain some limitations to these studies

Although the term "lecithin" is synonymous with phosphatidylcholine when used in chemistry, commercial lecithins are usually prepared from soybean, sunflower, and rapeseed, and may contain anywhere from 20%-90% of phosphatidylcholine

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