FGF21

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Also called: FGF-21, GLP-1 and FGF21 dual agonist, FGF21 analog

By The Health Stacks Research TeamUpdated September 20, 2026

FGF21 is a hormone that your liver makes. Hormones are messengers that travel in the blood and tell parts of the body what to do. FGF21 goes up when you fast, when you eat very few carbs, or when you eat less protein. It is not an approved medicine, but drug companies are studying copies of it for obesity and diabetes.

FGF21 seems to help control hunger and cravings. Research in mice and monkeys shows it signals the brain to stop seeking sweet foods. It also helps control blood sugar and how the body handles fat. In animal studies, eating less protein raised FGF21, and this was linked to better blood sugar control and less fat buildup.

Here is the tricky part. Higher FGF21 levels in the blood are also seen in people with obesity, fatty liver, and heart disease. So it may be a warning sign that the body is under metabolic stress, not just a helper hormone. Most of the strong evidence comes from animals, not people. There are no approved dosing guidelines, and anyone considering it should be very careful and talk to a doctor.

Research-stageEarly-stage — evidence so far is mostly cell, animal, or preliminary human studies. Not an approved medicine. High confidence60–79 — backed by solid sources with good corroboration across multiple citations.

Benefits

What FGF21 Helps With

The benefits people report — backed by research.

Glycemic & metabolic (6)

Stimulates glucose uptake in adipocytes 90/100Rated 90/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Insulin sensitivity 90/100Rated 90/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Promotes ketogenesis during nutrient deprivation 90/100Rated 90/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Energy metabolism 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Treatment of metabolic disorders 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Regulation of glucose and lipid homeostasis 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →

Weight management (4)

Corrects obesity in mice 90/100Rated 90/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Liver health 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Weight management 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Resistance to dietary obesity and extended lifespan in transgenic mice 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →

Neuroprotection & cognitive (2)

Humanin has a neuroprotective role against Alzheimer's disease 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Brain / cognitive 65/100Rated 65/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →

More reported benefits (11)

Treatment of spinal muscular atrophy Type 2 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Treatment of pediatric graft-versus-host disease 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Treatment of MASH/metabolic disease 70/100Rated 70/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Durability of effect up to 7.5 years after single treatment 70/100Rated 70/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Extended half-life via conjugation 70/100Rated 70/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Treatment of Leber Congenital Amaurosis 1 65/100Rated 65/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Protects against pancreatic injury 90/100Rated 90/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Anti-inflammatory 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Reduces fat accumulation and increases hepatocyte proliferation 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Cytoprotection 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Treatment of synovial sarcoma 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →

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News

Latest on FGF21

Dated, sourced reporting that mentions FGF21.

MarketSep 18, 2025

Roche enters into a definitive merger agreement to acquire 89bio, and its phase 3 FGF21 analog for the therapy of moderate to severe MASH

Roche announced a definitive merger agreement to acquire 89bio for US$14.50 per share in cash plus a non-tradeable CVR of up to US$6.00 per share, valuing the deal at up to roughly US$3.5 billion. The acquisition centers on pegozafermin, a glycoPEGylated FGF21 analog in Phase 3 development for moderate to severe MASH, including fibrotic (F2/F3) and cirrhotic (F4c) patients. Roche framed the deal as an entry into MASH with potential best-in-disease efficacy and possible combination development with incretins; closing was expected in Q4 2025.

40/100Rated 40/100Source typeVendor / seller pageIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →Read →

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