Is turmeric powder high in gluten?

Watch for

• Adulteration is the real risk with ground turmeric.Lead chromate has been added to brighten dull roots and has been traced to raised blood lead levels in South Asian populations, prompting repeated import alerts and recalls. Metanil yellow, starch and chalk also turn up. Buying whole rhizomes, or powder from a brand that publishes heavy metal testing, is the practical fix.
• Curcumin absorbs badly on its own and is cleared quickly.Piperine from black pepper and a source of fat both raise absorption substantially, which is why traditional cooking pairs turmeric with pepper and oil. Note the trade-off: black pepper is high in salicylates, so that pairing costs you something if salicylates are your issue.
• Moderate on salicylates.A pinch stirred into a curry is a small exposure, but a daily gram-level supplement is an entirely different one and is a common hidden salicylate load in people who think they have eliminated everything.
• Moderate on oxalate and nickel.Culinary quantities are tiny, but concentrated extracts are the version that shows up in kidney stone and nickel dermatitis discussions, so dose rather than the spice jar is what to look at.
• Mild on histamine, tyramine and free glutamates, so it is rarely the culprit when a fermented or umami-heavy meal sets you off, even when turmeric was in the pan.