Soy Sauce Protocol
Produces a lower-histamine soy sauce using zeolite treatment. Soy sauce has no salicylates per the Swain study, so only histamine needs addressing.
Why Soy Sauce
Soy sauce is high histamine due to fermentation but is confirmed salicylate-free. It’s also a significant umami source that’s difficult to replace. Zeolite treatment alone should make it more tolerable.
Mechanism
Same as Method Z — Zeolite Histamine Removal. Histamine is positively charged, zeolite is negatively charged — cation exchange pulls histamine out of solution into the zeolite lattice.
Protocol
- Add food-grade zeolite to soy sauce
- Agitate, steep at room temperature or refrigerated (refrigerated preferred for food safety)
- Centrifuge — zeolite pellets at bottom
- Decant, keep soy sauce, discard pellet
- Bottle and refrigerate
No oil step needed — no salicylates to remove.
Zeolite vs Bentonite
Both are clay minerals that work via cation exchange. Research suggests:
- Zeolite (clinoptilolite) may be more selective for histamine specifically
- Bentonite is better studied for mycotoxin removal; histamine binding is secondary
- Bentonite can occasionally trigger histamine release in some sensitive individuals — a concern worth noting
- Zeolite preferred for this application
What Zeolite Also Removes
Zeolite may remove some proteins and other positively-charged molecules alongside histamine. This could affect the depth of flavor slightly. Soy sauce has enough complexity that this is likely minor, but empirical tasting needed.
Flavor Impact
The core umami compounds (glutamates, nucleotides) are primarily water-soluble and neutral/anionic — they should not be significantly affected by cation exchange. The umami character of the soy sauce should largely survive.
Notes
- Coconut aminos are not a safe alternative — they are also fermented and high histamine
- This protocol is novel; no published prior art found
- Small test batch recommended before treating large quantities
- Zeolite rechargeable with salt water — see Method Z — Zeolite Histamine Removal
Future Extension
A bentonite or zeolite pass could theoretically be applied to other fermented condiments: fish sauce, Worcestershire, miso. Each would need individual assessment for salicylate content to determine if Method A is also needed.