Rice syrup

Rice syrup is low in histamine and generally safe for people with histamine intolerance or MCAS. It is made by breaking rice starch down into sugars with enzymes, not by fermenting or aging a protein food, so it does not build the kind of histamine you find in cheese, cured meat, or fish.

Why rice syrup is rated low

Histamine forms when specific bacteria act on the protein in foods during fermentation, curing, aging, or warm storage. Rice syrup starts from rice, which is a low-histamine grain, and the syrup is made by enzymatically converting its starch into sugar. That enzyme step is not the same as bacterial fermentation, and there is very little protein involved, so there is nothing for histamine-forming bacteria to work on.

What changes your risk

• Plain versus flavored — plain brown rice syrup is the safe choice. Some syrups add malt, other flavorings, or blend in extras, so a short ingredient list is best.
• Storage after opening — the syrup itself keeps well, but keep the jar sealed and clean so moisture and mold cannot get in. If you ever see mold on the surface, discard the whole jar.
• Barley malt blends — some rice syrups are cut with barley malt syrup. Malt is not usually a big histamine concern, but if you want the simplest profile, choose a pure rice version.
• What you pair it with — the syrup is neutral, so your reaction usually comes from the rest of the dish, not the sweetener.

What else is safe

Rice syrup, plain sugar, and pure maple syrup are all reasonable lower-histamine sweeteners, so you can rotate between them based on taste. Honey is generally tolerated by many people too. The one thing to steer clear of is assuming every syrup is equal: molasses and heavily flavored syrups are fine for many but come with stronger taste, and anything blended with fermented ingredients is worth checking on the label.

How to enjoy it

Look for a jar labeled brown rice syrup or rice malt syrup with just rice (and possibly a little enzyme or barley) on the ingredient list. Store it in a cool cupboard, wipe the rim, and keep the lid tight so it stays clean and dry. It is thick and mildly sweet, so it works well drizzled on rice, oats, or fresh fruit, or stirred into baking as a sugar swap.

Common questions

Is brown rice syrup fermented?

Not in the bacterial sense that builds histamine. It is made by using enzymes to turn rice starch into sugar, which is different from the fermentation that raises histamine in foods like yogurt or soy sauce.

Is rice syrup better than sugar for histamine intolerance?

They are about the same for histamine, both sit low. Choose based on taste and how your body handles the sugars, not histamine content.

Can rice syrup go bad and become high in histamine?

Pure syrup is very stable and low in protein, so it does not readily build histamine. Just keep it sealed and clean, and discard it if mold ever appears.