Why swallowed ATP does not reach muscle intact
Adenosine triphosphate is a charged, unstable molecule that the gut breaks down before absorption, so oral ATP does not raise the ATP inside working muscle directly. The proposed effect runs through its breakdown products: adenosine and related metabolites that can act on receptors in blood vessel walls and on circulating cells.
PEAK ATP is the branded disodium salt used in most of the published trials, which is why it appears by name.
What the downstream signaling is proposed to do
Some short studies report increased blood flow (vasodilation) and shifts in recovery markers after supplementation, with a few showing small strength or hypertrophy differences over training. The trials are small, several are industry-funded, and results are mixed, so the mechanism is better described as plausible than established.
This is general educational information, not medical advice. Evidence here is preliminary and effect sizes are modest at best. Consult a qualified professional before use, especially if you have cardiovascular conditions or take blood-pressure medication.