Chlorophyll and chlorophyllin aren't the same molecule. Chlorophyll is what makes plants green. Chlorophyllin, the version in the drops and capsules, swaps the magnesium for copper and cuts the fatty tail off, so it dissolves in water and survives your stomach.

The one thing it does is physical. It's a flat ring, and it binds other flat rings: aflatoxin (a mould toxin on badly-stored peanuts and corn), the heterocyclic amines from charred meat, the carcinogens in smoke. The pair is too big and too water-loving to cross out of your intestine, so it leaves in stool ¹. That's the whole mechanism: it works in the gut, on the toxin arriving in the same meal. It can't reach anything already absorbed, stored in fat, or outside the intestine.

One trial carries the entire case. In a Chinese region with extreme dietary aflatoxin, chlorophyllin cut the DNA-bound aflatoxin marker by about half ². That marker isn't cancer, and no study has ever carried it to a hard endpoint or repeated it where exposure is normal. Everything else the drops are sold for is thinner: the oral deodorant claim failed its one controlled trial ³, and swallowed chlorophyll has never been tested for skin at all. The skin signal that exists is for a topical cream, in studies under fifteen people with industry funding ⁴.

Only two situations justify buying it. Screen yourself first, then dose it right.

Cheap, and mostly the same everywhere. Drops or capsules run $10 to $20 a month, the cream $30 to $60. A cup of cooked spinach carries roughly 70 mg of chlorophyll, so a day of greens is near the trial dose by mass, but as chlorophyll, which digestion breaks down harder than the stabilized chlorophyllin form. Eat the greens for nutrition; they don't replace the capsule on the one job it actually has.