Wholesale · Growth hormone secretagogue
Wholesale MK-677 (Ibutamoren / Nutrabol)
Bulk powder, capsules and white label — B2B supply from our UK and EU facilities. An orally active growth hormone secretagogue originally developed by Merck & Co., manufactured to GMP standard at ≥98% purity with a Certificate of Analysis on every batch. Supplied strictly B2B for research purposes only.
≥98% HPLC & LC-MSMOQ from 10gWhite label available
GMP · ISO · HACCPUK & Berlin manufacturingThird-party testedManufacturer direct since 2018
Overview
A growth hormone secretagogue — not a SARM
Different receptor
A ghrelin receptor (GHSR-1a) agonist, not an androgen receptor modulator.
Orally active
No injection required, unlike GH peptides.
~24 hour half-life
Supports once-daily protocols in research settings.
MK-677 (Ibutamoren), also known as Nutrabol and L-163,191, is an orally active growth hormone secretagogue originally developed by Merck & Co. Unlike SARMs, which act on androgen receptors, MK-677 works as a selective ghrelin receptor agonist — stimulating the pituitary gland to increase secretion of growth hormone (GH) and insulin-like growth factor 1 (IGF-1). Its oral bioavailability and long half-life have made it one of the most commercially significant compounds in the wholesale research market.SARMs Direct supplies wholesale MK-677 in raw powder and encapsulated formats to supplement brands, sports nutrition retailers, research institutions, white label operators and distributors across Europe and internationally. All supply is strictly B2B and sold for research purposes only.
Compound specifications
MK-677 at a glance
| Compound name | Ibutamoren |
| Common aliases | MK-677, Nutrabol, L-163,191 |
| Compound class | Growth hormone secretagogue (ghrelin receptor agonist) |
| CAS number | 159752-10-0 |
| Molecular formula | C₂₈H₄₀N₄O₈S₂ (mesylate salt form) |
| Molecular weight | 624.77 g/mol (mesylate) |
| Purity | ≥98% (HPLC & LC-MS verified) |
| Appearance | White to off-white crystalline powder |
| Storage | Cool, dry place. Protect from light and moisture. Stable at room temperature when sealed. |
Available formats & MOQs
Four ways to order
FORMAT 01
Raw powder
MOQ 10g per batch
Available in 10g, 50g, 100g, 500g and 1kg quantities. Vacuum-sealed in double-layered pouches with no compound names on outer labels. COA included. See raw powders →FORMAT 02
Encapsulated
MOQ 1,000 units per strength
Available at 10mg and 25mg per capsule, supplied in tamper-evident bottles. White label and private label packaging available. See capsules →FORMAT 03
Liquid suspension
MOQ on request
Available on request. Contact us for concentration options and minimum order quantities for your requirement.FORMAT 04
White / private label
MOQ 1,000 units per SKU
Custom branding, label design and packaging, with typical turnaround of 14–21 days from artwork approval. See white label →Research context
Mechanism & study background
All products are supplied for research purposes only and are not intended for human or veterinary use. No claims of safety or efficacy are made.
Wholesale peptides with complementary GH-axis mechanisms — including IGF-1 analogues — are available via our sister site Peptide-Direct →
MK-677 stimulates GH secretion by mimicking the action of ghrelin, binding to the ghrelin receptor (GHSR-1a) in the pituitary and hypothalamus. Unlike exogenous GH administration, it works by amplifying the body's own pulsatile GH release — which has made it a subject of significant research interest for conditions involving GH deficiency, muscle wasting and metabolic decline.Research has explored its potential in elderly populations for lean mass preservation, bone mineral density, sleep quality and appetite regulation. Its long half-life of approximately 24 hours allows for once-daily oral administration in research protocols, which contributes to its commercial appeal relative to injectable GH peptides.Because it acts on a different receptor system from androgen-targeting compounds, MK-677 is frequently studied alongside SARMs such as Ligandrol (LGD-4033) and Ostarine (MK-2866) in research examining complementary mechanisms.
Quality & documentation
Every batch documented
- GMP-certified manufacturing
- ISO quality management system
- HACCP-compliant production controls
- Independent third-party testing — HPLC, LC-MS, ICP-MS
- Certificate of Analysis (COA) issued per batch
- MSDS available on request
- Research Use Only labelling included
- Full export documentation provided
Who orders wholesale MK-677
B2B buyers we supply
Supplement brands
Anti-ageing, sleep and performance capsule formulations.
Sports nutrition retailers
Shelf-ready capsules for resale.
Research institutions
Raw powder for GH secretagogue studies.
Clinics & wellness businesses
GH-axis research programmes.
E-commerce operators
Private label SARMs and GHS brands.
Distributors
Bulk powder for regional distribution across the EU and UK.
Request a wholesale MK-677 quote
Tell us the format, strength and quantity you need. We reply within 24 hours with tiered pricing and a current batch COA on request. COAs, pricing and samples available — B2B enquiries only.
Frequently asked questions
Is MK-677 a SARM?
Technically, no. MK-677 is a growth hormone secretagogue — a ghrelin receptor agonist — not a selective androgen receptor modulator. It is commonly supplied alongside SARMs due to its complementary research applications and commercial demand in the same market.
What is the CAS number for MK-677 (Ibutamoren)?
The CAS number for MK-677 is 159752-10-0. Its molecular formula in mesylate salt form is C₂₈H₄₀N₄O₈S₂ with a molecular weight of 624.77 g/mol.
What purity is your wholesale MK-677?
Our MK-677 consistently tests at ≥98% purity, verified by HPLC and LC-MS. A COA from an independent EU-accredited laboratory is available for every batch. See how testing works.
What formats is wholesale MK-677 available in?
Raw powder (MOQ 10g), encapsulated at 10mg and 25mg per capsule (MOQ 1,000 units per strength), and liquid suspension (MOQ on request). White label options are available for all formats.
What is the minimum order quantity?
Raw powder: 10g minimum, available in 10g, 50g, 100g, 500g and 1kg quantities. Capsules: 1,000 units per dosage strength. White label: 1,000 units per SKU.
Do you ship wholesale MK-677 internationally?
Yes — to the EU, UK, USA, Canada, Australia and other markets. All shipments include compliant customs documentation, COA and research-use labelling. See our shipping & logistics page for country detail.
Buyers of MK-677 (Ibutamoren / Nutrabol) also order
Ostarine (MK-2866)The most widely studied SARM, with the most extensive trial record.Ligandrol (LGD-4033)Greater receptor binding affinity at lower concentrations.RAD-140 (Testolone)High receptor selectivity, widely researched.Cardarine (GW-501516)PPARδ agonist studied for metabolic research applications.
All products are sold strictly for laboratory research purposes and are not for human consumption. Buyers are responsible for ensuring compliance with applicable regulations in their jurisdiction.