fyi Recipe section of the cookbook is now a download pdf at the site. It reads clearly.
98% pure lab grade Caffeic acid is available. About $40 US for 2 grams. Has anyone discovered the actual amount of caffeic acid released from the 'coffee crystals' of choice. Note: the high purity goodie is not listed as soluble in water; (solubility ethanol: soluble50 mg/mL).