Nicest tasting protein I've ever had. Mixes extremely well also. Been using it with Designer rice pudding and it's delicious.
Locked In Ultimate EAAs
9 ESSENTIAL AMINO ACIDS + FULL HYDRATION PANNEL
Designed to support hydration, endurance, and muscle recovery during training and beyond.
Packed with all 9 essential amino acids (EAAs) plus key electrolytes and patented AstraGin®, this formula fuels muscle recovery, enhances endurance, and keeps you performing at your peak — both in and out of the gym.
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Supports muscle recovery & growth
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Promotes optimal hydration
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Boosts performance & endurance
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Enhances nutrient absorption (AstraGin®)
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Tastes amazing & mixes smooth
KEY INGREDIENTS
9 Essential Amino Acids (EAAs) – Complete muscle recovery and protein synthesis support.
L-Leucine, Isoleucine & Valine (BCAAs) – Reduce fatigue, prevent muscle breakdown, and accelerate repair.
Electrolyte Blend (Sodium, Potassium, Himalayan Salt) – Replenish lost minerals and maintain hydration.
AstraGin® (50mg) – Clinically proven to increase amino acid absorption and nutrient uptake.
HOW TO USE
Mix 1 scoop (13.5g) with 500ml–1L of cold water.
Consume during training to stay hydrated and fuel performance, or throughout the day to support recovery and lean muscle growth.
THE RESULT
Recover faster. Train harder. Stay Locked In.
Your go-to intra-workout for strength, hydration, and performance — no matter the session.
Gas Mark 10 – Locked In
Believe in the man. Believe in the brand.
FREE SHIPPING ON ALL ORDERS OVER £100
UK Shipping
Standard UK delivery takes 2–5 business days once dispatched.
All orders are dispatched from our UK warehouse within 1–3 business days.
During peak periods, dispatch may take up to 5–10 business days.
How are orders shipped?
Orders are shipped from the UK via DPD, Royal Mail, or Evri, depending on the size and weight of the package.
Do you ship internationally?
No — we currently ship within the UK only.
Will I receive tracking information?
Yes. Once your order has shipped, you’ll receive an email containing your tracking details.
If you haven’t received tracking information within 5 business days, please contact us.
My tracking shows “no information available”
Some carriers can take 2–5 business days to update tracking information.
If your order was placed over 5 business days ago and tracking has not updated, please get in touch.
Will my order arrive in one package?
For logistical reasons, items from the same order may occasionally be shipped in separate packages.
Need help?
If you have any other questions, please contact us and we’ll be happy to help.
Locked In Ultimate EAAs
Sale price£35.00
Choose options
Locked In Ultimate EAAs
Sale price£35.00
KEY BENEFITS
TRIED. TESTED. TRUSTED.
Real feedback from people who put in the work
Customer Reviews
Overall rating: 4.9 / 5 from 1070 reviews.
Great product love it best in the business
Fantastic supplements and taste real good.
The best of both worlds and the taste is another level the new goat
Been taking body armour for about 2 months now, seen massive improvements in blood pressure and sleep! Will be continuing to take for the foreseeable future.
Mint
The best supplement, great taste, and best supplements is gas mask10
The best supplements I’ve had, they help me well and truly. just the brand
I have this first thing everyday very good for my digestion
Tastes so good.
This product is the king of any cream of rice and oaks combined great flavour mixes really well gasmark10 never miss on flavours and great quality of product does what it says on the packet definitely 5 star for sure if I could go higher I’d give it a ten star unbelievable products taste amazing great company great team for sure don’t just take my word for it try it yourself guys you won’t be disappointed that’s for sure
Love all the products
Very good products that taste delicious
Great tasting whey!! No lumpy or botty when mixed and the creatine is making a real difference in my strength and endurance
Just tried something different making some healthy cake. These two products made it taste amazing highly recommend.
New to the brand! But love the tees. Not too baggy not too heavy! Perfect combo! 👌 Deffo buying more
It's come rock solid
Works really well tasty as f best flavour if tried
Love this one tastes good and can feel the effects when working out MUST HAVE
Best EEAs if used work as they should do
Awaiting to see results but tasty as f
Delivered fast and tasted good, most results I’ve had using this preworkout
Delivered fast and tasted good
Wow! This stuff does exactly as advertised, didn't expect anything less from the Gas Mark 10 team. Another product and flavour that exceeded my expectations 10/10. This will be part of my morning routine everyday from now on.
PITBULL PEELED IS MY NUMBER 1 GO TO FOR A GREAT FOCUS FOR MY TRAINING AND CARDIO 💪🏽💯👌🏽👍🏽
One of the best tasting protein powders great quality!
Great way to keep hydrated through your workout fantastic taste highly recommend
Best ever
Best protein ever
Best
11 out of 10 on the pump brilliant effort
I ordered chocolate brownie flavour and I’ve had all others but this one is top of that list. All have been bang on and used through prep and now off season. Never had an issue with any product at Gasmark and the flavours are the best I’ve had. I’ve cooked, made whey paste, pancakes you name it and it works with everything. 10/10 service and delivery is always fast.
Been have the shrink wrap last new few ther brill would deffo recommend
Nice shaker
Been have this for last few months best fat burner drink out there
Vanilla icecream Didnt think the banana could be beaten, but this tops it. Literally tastes like milkybar. Best tasting protein on the market without doubt 🔥
Great product best cream of rice I’ve ever tasted in my life mixes well textures great flavours amazing no lumps definitely does what it says on product definitely a five star from me for sure ⭐️⭐️⭐️⭐️⭐️⭐️ gasmark10 definitely done well with this product for sure
Mint stuff a lot off crap out there this dose what it says
Great product and excellent fast delivery
Best stuff on the market imo
BUILT BY ROB TAYLOR
Believe in the man. Believe in the brand.
A man who’s lived every rep, every grind, every setback, and every win.
Gas Mark 10 isn’t a brand built in a boardroom — it’s forged through years of discipline, sweat, and relentless drive. Every product reflects the standards Rob trains by.
No shortcuts. No fillers. No games.
SHOP ROB'S FORMULATIONSCUSTOMER FAVOURITES
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PRODUCT INFORMATION
Frequently Asked Questions
Designed for people who train regularly and want reliable support around performance and recovery.
Usage instructions are listed on the label. Follow the recommended serving size.
Yes. GM10 products are designed to work together. Suggested stacks are shown above.
Yes, when used as directed.
All products are produced to strict quality standards using carefully selected ingredients.