FLGR242
Described by its seller (BioLongevity Labs) as a fragmented, modified follistatin-344 with an albumin-binding tag (~40 kDa) that binds myostatin but not activin, for a longer half-life. Marketed for preserving muscle during GLP-1 weight loss; there are no peer-reviewed studies and sellers disagree on whether it derives from follistatin or FSTL3.
Not approved; no published research. Research use only.
Look it up on Wikipedia15 listings across 3 independently tested vendors, ranked by price per milligram after coupon codes anyone can use. Vendors you can only order from by message are hidden.
Daily price tracking started October 7, 2026; a price-history chart appears here once a few days have been collected.
| Vendor | Trust | Listing | Vials | Price | Per mg | |
|---|---|---|---|---|---|---|
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
FLGR242 (10mg) 6 Pairs (12 Vials) – Save 5% | 12 × 10 mg = 120 mg | $1,749.00 $145.75 per vial |
$14.58 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
FLGR242 (10mg) 1 Pair (2 Vials) | 2 × 10 mg = 20 mg | $299.00 $149.50 per vial |
$14.95 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
FLGR242 (10mg) 48 Pairs (96 Vials) – Save 20% | 96 × 10 mg = 960 mg | $14,352.00 $149.50 per vial |
$14.95 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
FLGR242 (10mg) 24 Pairs (48 Vials) – Save 15% | 48 × 10 mg = 480 mg | $7,176.00 $149.50 per vial |
$14.95 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
FLGR242 (10mg) 12 Pairs (24 Vials) – Save 10% | 24 × 10 mg = 240 mg | $3,588.00 $149.50 per vial |
$14.95 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
Follistatin (FLGR242) (10mg) Subscription 8 Vials | 8 × 10 mg = 80 mg | $1,796.40 $224.55 per vial |
$22.46 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
Follistatin (FLGR242) (10mg) Subscription 6 Vials | 6 × 10 mg = 60 mg | $1,347.30 $224.55 per vial |
$22.46 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
Follistatin (FLGR242) (10mg) Subscription 4 Vials | 4 × 10 mg = 40 mg | $898.20 $224.55 per vial |
$22.46 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
Follistatin (FLGR242) (10mg) Subscription 2 Vials | 2 × 10 mg = 20 mg | $449.10 $224.55 per vial |
$22.46 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
SlimAssist (FLGR242 2MG / 500mcg B Complex) 2 Vials | 2 × 2 mg = 4 mg | $173.00 $86.50 per vial |
$43.25 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
SlimAssist (FLGR242 2MG / 500mcg B Complex) – Private Single Vial | 1 × 2 mg | $99.00 | $49.50 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
SlimAssist (FLGR242 2MG / 500mcg B Complex) Single Vial | 1 × 2 mg | $99.00 | $49.50 | Buy |
Peptagon #31 by metascore |
Metascore 82 medium confidenceFinnrick UnratedBought vials 102% of label · 3 testsTitrateLabNo report for thisConfirmed with lab: 38 of 38Online checkout |
FLGR242 Research Peptide – 5mg – 2 Vials | 2 × 5 mg = 10 mg | $631.00 $315.50 per vial |
$63.10 | Buy |
Biolongevity Labs #166 by metascore · US, Akron, OH 44321 |
Metascore 73Finnrick 71%PepIndex 58/100Bought vials 102% of label · 34 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
FLGR242 (Single Vial) | 1 vial, size not stated | $250.00 | – | Buy |
Alpha BioMed #281 by metascore · US |
FLGR242 (5mg) | 1 vial, size not stated | $105.00 | – | Buy |
Mixing a 10 mg vial
What each common amount of bacteriostatic water gives you on a U-100 insulin syringe. Pick a vial size above to change it.
| Water | Strength | Per 10 units (0.1 mL) | Per unit |
|---|---|---|---|
| 1 mL | 10 mg/mL | 1,000 mcg | 100 mcg |
| 2 mL | 5 mg/mL | 500 mcg | 50 mcg |
| 3 mL | 3.333 mg/mL | 333.3 mcg | 33.33 mcg |
| 5 mL | 2 mg/mL | 200 mcg | 20 mcg |
Published lab results
1 certificate of analysis that vendors publish for FLGR242. Numbers are only filled in where the document is readable text; image-only COAs are linked without numbers. A vendor's own COA shows one tested sample, not every batch.
| Vendor | Lab | Date | Label | Measured | Purity | Batch | |
|---|---|---|---|---|---|---|---|
Biolongevity Labs |
MDx BioAnalytical Laboratory | – | – | – | – | #261447 | View (image) |
Discussions elsewhere
Experiences and questions about FLGR242 on other sites. Treat anecdotes with care.
FLGR242: questions people ask
What is FLGR242?
Modified follistatin construct (vendor-proprietary). Described by its seller (BioLongevity Labs) as a fragmented, modified follistatin-344 with an albumin-binding tag (~40 kDa) that binds myostatin but not activin, for a longer half-life. Marketed for preserving muscle during GLP-1 weight loss; there are no peer-reviewed studies and sellers disagree on whether it derives from follistatin or FSTL3.
How much does FLGR242 cost?
The cheapest FLGR242 from an independently tested vendor is $14.58 per mg (Biolongevity Labs, FLGR242 (10mg) 6 Pairs (12 Vials) – Save 5%, $1,749.00). Across 15 listings from 3 vendors the median is $22.46 per mg.
Where can I buy FLGR242?
3 vendors tested by Finnrick sell FLGR242. The cheapest per mg right now: Biolongevity Labs ($14.58), Peptagon ($63.10). 0 of them publish a lab report (COA) for FLGR242; compare lab scores and reports in the table above before buying.
Is FLGR242 FDA approved?
Not approved; no published research. Research use only.