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Limited evidenceGut health

Tangerine Peel (Chen Pi)

Chen pi is a standard Chinese digestive herb rich in citrus flavonoids. The published work is chemistry, animal studies and microbiome research, with no randomized trial for bloating or appetite.

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What the science says

  • Digestive use Limited evidence

    A systematic review of Citri Reticulatae Pericarpium covering its phytochemistry, pharmacology and pharmacokinetics finds the digestive effects documented in animal and in vitro models rather than in clinical trials.

  • Gut microbiota Limited evidence

    A review of its effects on gut microbiota describes shifts in bacterial composition, largely from animal experiments. No human trial has linked those shifts to symptom relief.

Dosage & safety

Studied doseTraditional decoctions use 3–10 g of aged peel per day, usually as part of a formula. No trial-based dose exists.
SafetyCulinary amounts are safe. Concentrated citrus peel extracts may interact with drugs metabolised by CYP3A4. Do not confuse chen pi with bitter orange (synephrine) products, which have cardiovascular risks. Little data in pregnancy.

How to take it

TimingTraditionally taken before meals.
With food?Before or with food.
Worth knowingCheck the label says chen pi or Citrus reticulata, not bitter orange, which is a different and riskier ingredient.

Interactions

With medications

  • drugs metabolised by CYP3A4 such as statins, some calcium channel blockers and certain immunosuppressants

    Concentrated citrus peel extracts can slow their breakdown and raise blood levels; culinary amounts do not. treat concentrated extracts as you would grapefruit and ask a pharmacist

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does tangerine peel (chen pi) help bloating or digestion?

There is no randomized trial of chen pi for bloating or appetite, so the evidence is limited. Its digestive effects are documented in animal and in vitro studies.

Is chen pi the same as bitter orange?

No. Chen pi is aged Citrus reticulata peel, while bitter orange (synephrine) products are a different ingredient with cardiovascular risks, so check the label.

How much tangerine peel should I take?

Traditional decoctions use 3–10 g of aged tangerine peel per day, usually within a formula and before meals. No trial-based dose exists.

Does tangerine peel interact with medications?

Culinary amounts of tangerine peel do not, but concentrated citrus peel extracts can slow the breakdown of CYP3A4 drugs such as statins, some calcium channel blockers and certain immunosuppressants. Treat concentrated chen pi extracts as you would grapefruit and ask a pharmacist.

Scientific references

Related in Gut health

Herbal medicines: what the evidence says (335)