Richard Dews Barclay has written:

'Properties of the adenosine triphosphatase from sea urchin sperm flagella: a comparison with myosin' -- subject(s): Spermatozoa, Motility, Myosin

"The Proton pump inhibitor comes in capsules, tablets and also a powder for people who may be allergic to the coatings or capsules, this medication is used to treat GERD, it works by blocking the hydrogen/potassium adenosine triphosphatase enzyme , which causes secreting H+ ions into the gastric lumen, making it an ideal target for inhibiting acid secretion."

Adenosine is composed of an acid and a sugar.

By phosphorylation

Adenosine tablets are available, but adenosine is rapidly destroyed by acids and adenosine deaminase.

Adenosine monophosphate is mentioned as a prodrug, but even it seems to need to be injected.

I've seen ATP as a suppliment, but I have no idea how absorbable it is.