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Phloretin is a dihydrochalcone, a naturally occurring plant phenol found in apples, apple tree leaves, and the Manchurian apricot. It is the aglycone of phlorizin, meaning the sugar-free core of that better-known apple compound, and it is studied chiefly as an antioxidant and as an inhibitor of glucose transport across cell membranes. Phloretin appears as an ingredient in some skincare products and is a subject of laboratory research, but it is not an approved medicine.
- Strong topical antioxidant
- Stabilizes vitamin C serums
- Photoprotective for skin
- Lab-level glucose transporter inhibition
- Topical cosmetic use is generally well tolerated, but skin irritation or allergy is possible
Overview
Phloretin is a dihydrochalcone, a class of natural phenol related to the flavonoids, with the molecular formula C15H14O5 [2]. It occurs in apple tree leaves, in apples, and in the Manchurian apricot, and it is the aglycone of phlorizin (also spelled phloridzin), the sugar-bearing apple compound from which phloretin is released when the sugar group is removed [1][2].
Much of the interest in phloretin comes from a set of biological activities observed largely in laboratory and animal studies, including antioxidant, anti-inflammatory, and antidiabetic effects [1][2]. It is a classic inhibitor of glucose transport: it blocks the movement of glucose across cell membranes, reducing the uptake of sugar by cells, its absorption in the intestine, and its reabsorption in the kidney, although it does this less potently than its glycoside phlorizin [2]. It has also been reported to interfere with the transport of urea and water across membranes [1].
In preclinical cancer research, phloretin has been studied extensively for antiproliferative, pro-apoptotic, and anti-angiogenic effects across a range of tumor cell and animal models, in part by blocking the glucose supply that tumor cells rely on [1][2]. In a metabolic study it prevented high-fat-diet-induced obesity and improved measures of metabolic health in mice [3]. Separately, phloretin is used as a topical antioxidant in cosmetic skincare formulations.
Several caveats temper these findings. Phloretin is a lipophilic molecule that inserts into and disrupts cell membranes, and it has been flagged as a pan-assay interference compound, meaning that some of its wide-ranging effects in test-tube assays may be non-specific rather than the result of a single defined target [2]. Its bioavailability is limited, and after ingestion it is broken down into products such as phloretic acid and phloroglucinol [4]. It is not an approved drug and is used mainly as a research chemical, a dietary polyphenol, and a cosmetic ingredient; robust human clinical evidence for health benefits is lacking [2][4].
Mechanism
Phloretin is best known as an inhibitor of facilitated glucose transport [1][2]. It blocks the GLUT family of glucose transporters and the sodium-dependent SGLT transporters embedded in cell membranes, which reduces the entry of glucose into cells, its absorption from the intestine, and its reabsorption in the kidney, though it is a weaker inhibitor than the related compound phlorizin [2]. It also scavenges reactive oxygen species and dampens inflammatory signaling, which underlies its reported antioxidant and anti-inflammatory actions, and in cancer cell models it curtails the glycolytic fuel supply of tumor cells and promotes programmed cell death [1]. Because phloretin is a molecule that partitions into and perturbs cell membranes, some of its broad activity in laboratory assays may be non-specific, and it has been categorized as a pan-assay interference compound [2].
receptor fingerprint
Free radicals / ROSscavenges
Vitamin C stabilityenhances
GLUT2 / SGLT1 glucose transportersinhibits
Skin inflammationreduces
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
Topically it is well tolerated and non-irritating for most people. Oral supplement safety is not well characterized, as it is not a common standalone oral product. Its glucose-transporter effects are theoretically relevant to people on diabetes medication, but real-world oral impact is unproven.
Subjective profileweighing the evidence above
A good topical antioxidant, especially alongside vitamin C; the oral metabolic claims are thin, so its real value sits in skincare.
Resources
This entry is here for reference.
Research
- 2001first citedBioavailability of phloretin and phloridzin in rats.
- 2022most recentPhloretin, as a Potent Anticancer Compound: From Chemistry to Cellular Interactions.
- 1.Biochemical Basis of Anti-Cancer Effects of Phloretin, a Natural Dihydrochalcone.
- 2.Phloretin, as a Potent Anticancer Compound: From Chemistry to Cellular Interactions.
- 3.Phloretin Prevents High-Fat Diet-Induced Obesity and Improves Metabolic Homeostasis.
- 4.Bioavailability of phloretin and phloridzin in rats.
4 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Why is phloretin in vitamin C serums?
It stabilizes vitamin C and adds its own antioxidant punch, improving the serum's effectiveness and shelf life.
Does oral phloretin lower blood sugar?
It blocks glucose transporters in the lab, but there is no solid human evidence it works as an oral supplement.
Is it the same as phlorizin?
They are related; phlorizin is the glycoside that breaks down into phloretin, and phlorizin is the classic SGLT inhibitor.
Can I get it from apples?
Yes, apples and apple peel contain it, but dietary amounts are small.
Limitations of the evidence
- Phloretin is a dietary polyphenol and is not an approved medicine; most information about it comes from laboratory and animal studies rather than human trials
- Because it inhibits glucose transport, it could in principle affect blood sugar handling, though this has not been established in people
- As a membrane-active compound, some of its many reported effects in cell studies may be non-specific
- Its safety in pregnancy, in children, and with long-term use has not been well studied
Adverse effects
- Topical cosmetic use is generally well tolerated, but skin irritation or allergy is possible