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Cinnamon

Supplement botanical general nutrition
Aka: Ceylon cinnamon, Cinnamomum verum, cassia
Brands seen in Singapore: California Gold Nutrition, Frontier Co-op, Simply Organic, 21st Century, Micro Ingredients
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Culinary spice — no clear benefit shown for any condition
When to take
Daily
Studied for
NCCIH notes long or large use raises side effects
Pros & cons
Pros
  • Safe in the amounts used in food as a spice
  • Widely studied — many trials exist, mostly unclear
  • Ceylon form carries only a trace of coumarin
Cons
  • Research doesn't clearly support any health use
  • Labels often omit the species and plant part used
  • Cassia coumarin — an issue for sensitive people
Sources
  1. NCCIH — Cinnamon: Usefulness and Safety (Background; last updated November 2024) · read 2026-08-27
    what it says
    “Cinnamon is a spice that comes from the dried bark of various species of Cinnamomum trees. Ceylon cinnamon (Cinnamomum verum), known as “true” cinnamon, grows primarily in Sri Lanka.”
  2. NCCIH — Cinnamon (What Have We Learned?) · read 2026-08-27
    what it says
    “Research doesn't clearly support using cinnamon for any health condition.”
  3. NCCIH — Cinnamon (How Much Do We Know? / evidence quality) · read 2026-08-27
    what it says
    “There have been many studies of cinnamon … However, the results of the studies are difficult to interpret because it's often unclear which species or part of the cinnamon plant was tested.”
  4. NCCIH — Cinnamon (What Do We Know About Safety? — food amounts vs larger amounts) · read 2026-08-27
    what it says
    “Cinnamon is likely safe when consumed in the amounts commonly used in foods … When used in larger amounts or for long periods of time, cinnamon is sometimes associated with side effects, most commonly gastrointestinal problems or allergic reactions.”
  5. NCCIH — Cinnamon (Safety: coumarin and the liver) · read 2026-08-27
    what it says
    “Interactions between coumarin, a chemical found in cassia cinnamon, and the liver have been reported … Prolonged use of cassia cinnamon could be an issue for sensitive people, such as those with liver disease.”
  6. NCCIH — Cinnamon (Safety: species and plant part not always labelled) · read 2026-08-27
    what it says
    “Cinnamon products may not clearly indicate which species (e.g., Ceylon, cassia) or parts (e.g., bark, leaves, roots) of cinnamon have been used in the making of a product.”
  7. NCCIH — Cinnamon (Safety: medicine interactions) · read 2026-08-27
    what it says
    “there are theoretical reasons to suspect that some components of cinnamon may interact with an anticancer medicine or nicotine. If you take any type of medicine, talk with your health care provider before using cinnamon”
  8. NCCIH — Cinnamon (Safety: pregnancy and breastfeeding) · read 2026-08-27
    what it says
    “Some studies of the use of Ceylon and cassia cinnamon during pregnancy suggest it is safe in amounts commonly found in foods, but Ceylon cinnamon in larger amounts during pregnancy is considered unsafe.”
  9. NCCIH — Cinnamon (Safety: the “cinnamon challenge”) · read 2026-08-27
    what it says
    “Never consume cinnamon powder as part of the “cinnamon challenge,” an unsafe internet dare. Serious harm is possible.”
  10. HSA Singapore — Health Supplements Guidelines, GL-CHPB-3-001 Rev. No. 020 (January 2026), s6.6 and Table 6: Examples of Diseases/Conditions/Disorders Not Allowed for Health Supplements · read 2026-08-27
    what it says
    “HS must not be labelled, advertised or promoted for any specific medicinal purpose … Endocrine system: Diabetes, thyroid disorders … Metabolic system: Obesity, gout”
  11. HSA Singapore — Prohibited and Restricted Ingredients in HS and TM, GL-CHPB-1-012 Rev. No. 001 (October 2025), Annex item 95 — the senna genus Cassia, NOT Cinnamomum cassia · read 2026-08-27
    what it says
    “95. Senna alexandria, Cassia spp. — Restricted use in HS and TM — Cautionary Statement: “Contains sennosides. Prolonged use may cause serious bowel problems and loss of essential minerals. Seek medical advice for use beyond 1-2 weeks.””
  12. HSA Singapore — Guidelines on Prohibited and Restricted Ingredients in HS and TM, GL-CHPB-1-012 Rev. No. 001 (October 2025), Annex A/B full ingredient list · read 2026-08-27
    what it says
    “GUIDELINES ON PROHIBITED AND RESTRICTED INGREDIENTS IN HEALTH SUPPLEMENTS AND TRADITIONAL MEDICINES … The information in these Guidelines may be updated from time-to-time.”
  13. iHerb Singapore — Cinnamon Products category, default order (1 - 48 of 79 results) · read 2026-08-27
    what it says
    “California Gold Nutrition, Foods, Organic Saigon Cinnamon … Frontier Co-op, Organic Ceylon Cinnamon … Simply Organic, Ceylon Cinnamon … 21st Century, Cinnamon plus Chromium … Micro Ingredients, Ceylon Cinnamon”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.