Buy MK-677 UK: 10 Best Suppliers Compared 2026

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Finding a reliable MK-677 supplier in the UK can feel like navigating a minefield. With dozens of vendors making bold claims about purity and quality, how do you separate the legitimate suppliers from the questionable ones?

UK SARMs is the best-rated UK supplier for MK-677 based on our research, with a 4.87/5 rating from 118 reviews, dual lab testing verification, and over 7,900 units sold.

I spent the past month researching the UK MK-677 market, comparing prices, verifying lab testing claims, and analysing customer feedback across 10 major suppliers. What I found was surprising – prices ranged from 37.95 to 79.99 GBP for essentially the same compound, and testing standards varied dramatically.

In this guide, I cover exactly where to buy MK-677 in the UK, compare all major suppliers side-by-side, and show you how to verify quality before you buy. Whether you want the cheapest option, the highest-rated supplier, or the best value per dose, you will find it here.

Important Notice: MK-677 (Ibutamoren) is not approved for human consumption in the UK. It is sold as a research chemical only and is banned in competitive sports by WADA. This guide is for informational purposes only.

Our Top 3 UK MK-677 Suppliers

After comparing all 10 suppliers, these three stood out for quality verification, customer feedback, and overall value.

UK MK-677 Suppliers at a Glance

Here is how all 10 UK MK-677 suppliers compare on price, form, dosage, and testing verification. Prices current as of 2026.

Detailed Supplier Reviews

1. UK SARMs – Best Overall With Dual Lab Testing

UK SARMs has built a reputation as the highest-rated MK-677 supplier serving the UK market. What sets them apart is dual laboratory verification – they test through both MZ Biolabs and Colmaric Analyticals, which provides an extra layer of quality assurance most competitors lack.

The liquid form offers flexible dosing between 12.5mg and 25mg daily. With over 7,900 units sold and a 4.87/5 rating, they have the track record to back up their claims.

Bulk buyers benefit from tiered discounts: 10% off 3 bottles, 15% off 6 bottles, and 20% off 9 bottles.

Best For

Researchers wanting verified purity and established reputation with the most customer validation.

Skip If

You prefer capsules over liquid form or need the absolute lowest price.

2. Affordable Nutrition – Lowest Price With ISO Certification

At 37.95 GBP for 60 capsules, Affordable Nutrition offers the lowest price point among legitimate UK suppliers. The ISO 9001 certification for their manufacturing facility adds credibility that helps offset their lower brand recognition.

Each capsule contains 12.5mg, which is a standard dose for most users. The Certificate of Analysis is available upon request, giving you verification of purity.

Best For

Budget-conscious researchers wanting quality assurance at the lowest possible price.

Skip If

You prioritise extensive customer reviews and established brand reputation over price.

3. Olympus Labs UK – Best Value Per Dose

Olympus Labs UK offers the best value when you calculate cost per milligram. Their bottles contain 90 capsules at 15mg each – that is 1,350mg total content compared to the 750mg typical of most competitors.

Janoshik is one of the most respected independent labs in the industry, and batch tracking allows you to verify exactly when your product was tested.

Best For

Those wanting high-dose capsules with verified purity and maximum content per bottle.

Skip If

You want a liquid form or need visible customer reviews before purchasing.

4. Receptor Chem – Most Established Since 2011

Receptor Chem claims to be the first SARMs distributor online, operating since 2011 from their London headquarters. Their blind independent testing means samples are submitted anonymously, removing potential bias from results.

The 25mg/ml concentration is the highest available among UK suppliers, making their 30ml bottle equivalent to a full research cycle at standard dosing. They also offer a 100% money-back guarantee.

Best For

Those wanting the most established reputation and highest concentration liquid form.

Skip If

You need immediate availability (check stock status) or prefer capsules.

5. Peak Body Nutrition – UK-Based Tablet Form

Peak Body operates from Washington, Tyne and Wear, making them one of the few genuinely UK-based suppliers rather than international companies shipping to the UK. Their tablet form differs from the capsules and liquids offered by most competitors.

The 3 for 2 offer on their SARMs range provides significant savings for those planning longer research periods.

Best For

Those preferring tablet form and want to support a genuinely UK-based company.

Skip If

You want the lowest price per dose or prefer liquid for flexible dosing.

6. Pharma Lab Global UK – Best First-Order Discount

First-time buyers get the best deal here. The 15% first-order discount using code “1storder” brings an already competitive 42.40 GBP price down further. Add the twin pack 10% discount for repeat orders and the value adds up.

The 10mg capsule dose is lower than most competitors, which may suit those starting with lower amounts.

Best For

First-time buyers wanting verified quality with maximum first-order savings.

Skip If

You want higher-dose capsules or maximum content per bottle.

7. Thoroughbred Labs – Best Bulk Discount

The “Buy 3, Get 50% Off The 4th” promotion makes Thoroughbred Labs ideal for anyone planning extended research. At standard pricing, four bottles would cost 179.96 GBP – with the discount, you pay around 157.47 GBP.

Certificate of Analysis documentation is available to verify purity claims.

Best For

Budget-conscious buyers planning to purchase 4+ bottles who want maximum savings.

Skip If

You need extensive brand reputation or customer review validation.

8. Smart SARMs – Best Brand Variety

Smart SARMs takes a different approach – rather than their own branded product, they stock MK-677 from seven different manufacturers. Options include Swiss Chems, Pure Rawz, Science Bio, Sports Tech Labs, Biaxol, Apex Receptor, and Optimised Research Labs.

Prices range from 39.99 GBP (ORL, Science Bio) up to 72.99 GBP (Pure Rawz), giving you flexibility based on brand preference and budget.

Best For

Those wanting to choose from multiple established brands in one place.

Skip If

You prefer a single trusted supplier rather than researching multiple brands.

9. Wartorn Labz – Best Pre-Made Stacks

Wartorn Labz caters to those interested in combining MK-677 with other compounds. Their pre-made stacks include MK-677 + RAD140 (49.99 GBP), MK-677 + LGD4033 (49.99 GBP), and the “Golden Stack” combining LGD4033, MK-677, and RAD140 (59.99 GBP).

The visible UK company registration (11476319) at their Mildenhall address provides transparency about their business legitimacy.

Best For

Those wanting convenient pre-formulated stacks without sourcing compounds separately.

Skip If

You want standalone MK-677 with extensive testing documentation.

10. Density Labs (via NI Supplements) – Established Brand

Density Labs is a recognised brand in the research chemical space, and NI Supplements is their UK retail partner. The 4.8/5 rating from 17 reviews provides customer validation, though it is a smaller sample than UK SARMs’ 118 reviews.

The 30-day return policy offers peace of mind for first-time buyers of this brand.

Best For

Those familiar with Density Labs brand wanting a trusted retail channel in the UK.

Skip If

You prefer buying direct from manufacturers or want higher-dose capsules.

What Is MK-677 (Ibutamoren)?

MK-677, also known as Ibutamoren or Nutrobal, is a growth hormone secretagogue that stimulates the pituitary gland to release more human growth hormone (HGH) and insulin-like growth factor 1 (IGF-1). Unlike injectable HGH, MK-677 is taken orally.

Despite sometimes being grouped with SARMs (Selective Androgen Receptor Modulators), MK-677 is technically not a SARM. It works through the ghrelin receptor rather than androgen receptors, which is why it does not suppress natural testosterone production.

Forms Available in the UK

UK suppliers offer MK-677 in three primary forms:

• Capsules: Most common form, typically 10-15mg per capsule. Convenient but less flexible for dose adjustment.
• Tablets: Similar to capsules, offered by suppliers like Peak Body.
• Liquid: Usually 25mg/ml concentration. Allows precise dosing but requires measuring.

Capsules at 12.5mg are the most popular choice among UK buyers based on product availability across suppliers.

Potential Benefits of MK-677

Research on MK-677 remains limited, and it has not been approved for human use by regulatory authorities. The following potential benefits are based on preclinical studies and user reports – they are not guaranteed outcomes.

Growth Hormone Elevation: Studies suggest MK-677 may increase GH and IGF-1 levels. Research from the Journal of Clinical Endocrinology found increases in serum GH levels, though long-term safety was not established.

Sleep Quality: Users frequently report improved sleep quality, particularly deeper sleep phases. This is consistent with the known relationship between growth hormone and sleep cycles.

Recovery: Forum users commonly report improved recovery between training sessions, which may relate to elevated GH levels. However, this is anecdotal evidence.

Appetite Increase: MK-677’s action on ghrelin receptors typically increases appetite significantly. Users report this peaks in the first few weeks of use.

No Testosterone Suppression: Unlike actual SARMs, MK-677 does not suppress natural testosterone production, meaning PCT (post-cycle therapy) is generally not required when used alone.

Side Effects and Safety Warnings

MK-677 carries significant potential risks that anyone considering its use should understand. This compound is not approved for human consumption, and clinical trials have been halted due to serious adverse events.

Commonly Reported Side Effects

• Increased Appetite: Often significant, particularly in the first 2-4 weeks
• Water Retention: Bloating and swelling are frequently reported
• Lethargy: Many users report feeling tired, especially during the day
• Numbness or Tingling: In hands and feet, similar to HGH side effects
• Joint Pain: Some users report muscle and joint discomfort

Serious Safety Concerns

Blood Sugar Impact: MK-677 may reduce insulin sensitivity and increase blood glucose levels. Users with diabetes or prediabetes should be particularly cautious. Studies have shown increased HbA1c levels.

Heart Failure Risk: The terminated clinical trial raised concerns about cardiovascular effects, particularly in vulnerable populations.

Liver Effects: Case studies have documented elevated liver enzymes (transaminitis) in some users. Liver function typically returns to normal after cessation.

This is not a complete list of potential side effects. Always consult a qualified healthcare provider before considering any research compound.

Is MK-677 Legal in the UK?

MK-677 is legal to purchase in the UK for research purposes. It is not a controlled substance under the Misuse of Drugs Act and can be bought and sold legally.

However, there are important caveats:

• Not Approved for Human Consumption: MK-677 has no regulatory approval from the MHRA (Medicines and Healthcare products Regulatory Agency) for human use. Suppliers sell it as a “research chemical” only.
• Banned in Sport: MK-677 is on the World Anti-Doping Agency (WADA) 2025 Prohibited List under “S2. 2.4 Growth hormone releasing factors.” It is detectable in blood and urine tests for up to several weeks.
• Import Restrictions: Some countries have stricter regulations. International orders may be subject to customs inspection.

The legal status means you can legally purchase MK-677 from UK suppliers, but using it for human consumption is done entirely at your own risk and without regulatory protection.

How to Verify MK-677 Quality?

With research chemicals, quality verification is essential. Here is what to look for when evaluating UK suppliers.

Third-Party Testing Methods

HPLC Testing (High-Performance Liquid Chromatography): The industry standard for purity verification. Separates compounds to identify exactly what is in a product and at what concentration. Look for suppliers showing HPLC results.

Blind Testing: The most reliable approach – samples are submitted anonymously so labs do not know whose product they are testing. Receptor Chem claims to use this method.

Named Laboratory Testing: Janoshik is the most respected independent lab in this space. Olympus Labs UK uses Janoshik testing. MZ Biolabs and Colmaric Analyticals (used by UK SARMs) are also recognised.

What to Look For

1. Certificate of Analysis (COA): Should show purity percentage, test date, batch number, and laboratory name
2. Batch Tracking: Ability to verify your specific batch was tested
3. Purity Claims: Reputable suppliers claim 99%+ purity with testing to prove it
4. Tamper-Proof Sealing: Bottles should arrive sealed to prevent contamination

Red Flags to Avoid

• No mention of third-party testing or laboratory verification
• Prices that seem too good to be true (under 30 GBP for 60 capsules)
• No company address or contact information
• Generic product descriptions copied from other sites
• No customer reviews or only generic positive reviews

Frequently Asked Questions

Final Verdict

For those researching MK-677 in the UK, UK SARMs offers the best combination of verified quality, customer validation, and reliability with their 4.87/5 rating and dual lab testing. Affordable Nutrition provides the lowest entry price at 37.95 GBP with ISO certification, while Olympus Labs UK delivers the best value per dose with 90 capsules at 15mg each.

The UK MK-677 market includes 10 legitimate suppliers with prices ranging from 37.95 to 79.99 GBP. Third-party testing verification should be your primary consideration – reputable suppliers like UK SARMs, Olympus Labs, and Receptor Chem provide transparent lab documentation.

Remember that MK-677 is not approved for human consumption, has been associated with serious side effects in clinical trials including heart failure risk, and is banned in competitive sports. Any use is entirely at your own risk.

Disclaimer: This guide is for informational and research purposes only. MK-677 (Ibutamoren) is not approved for human consumption by the MHRA or any regulatory authority. It is classified as a research chemical and is banned in sport by WADA. Clinical trials have been stopped due to adverse events including increased heart failure risk. Always consult a qualified healthcare provider before considering any compound. We may earn commissions from purchases made through links in this article at no extra cost to you.