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The Lean Protein
Whey protein powder for weight-loss.
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The Lean Protein | Innermost
The Lean Protein | Innermost
Sophie Apollonia smiling and looking confident for Innermost
The Lean Protein powder - a nutritional supplement developed by Innermost
The Lean Protein powder - a nutritional supplement developed by Innermost

The Lean Protein Trial Pack

Get lean the right way.

Three single-serve pouches of The Lean Protein in vanilla or chocolate. Ideal for when you're travelling or on-the-go. The Lean Protein is our whey protein powder for effective weight-loss.

Creamy vanilla flavour

The Lean Protein Trial Pack | 3 x 40g

Currently out of stock due to high demand

Smooth chocolate flavour

The Lean Protein Trial Pack | 3 x 40g

Currently out of stock due to high demand

$13.95 $13.95

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Product Highlights

Active Ingredients

For every serving of The Lean Protein: Protein (29g), Inulin (1g), Acetyl L-Carnitine (750mg), Pomegranates (500mg), Yerba Mate (500mg), Bilberries (250mg).

Scroll down to learn about these ingredients and how they benefit you.

This product is vegetarian, cruelty free, gluten free, soy free, halal, suitable for kosher diets, non-GMO, and free from most major allergens. Furthermore, the product contains no artificial fillers, bulking agents or colours, and our packaging is 100% recyclable.

Per: 40g 100g
Energy 626 kJ 1,565 kJ
Calories 148 kcal 370 kcal
Protein 29g 74g
Carbohydrates 4.5g 11.1g
of which sugars 1.1g 2.7g
Fats 1.2g 3.0g
of which saturates 0.4g 1.0g
Dietary fibre 1.5g 3.8g
Sodium 0.08g 0.20g

Allergens: Milk (whey). 
Other ingredients: Natural flavours only. Guar gum, which is a GMO-free, gluten-free, natural fibre that comes from the guar bean to give our shakes a creamy texture. We use sunflower lecithin instead of soy lecithin, which is the only kind of lecithin that can be obtained raw and chemical-free using a cold press system similar to that used with olive oil. We use sucralose as it is the most widely tested low-calorie sweetener and approved by all major food standard agencies in the world.

How And When To Use

A nutritious addition to your diet to help meet your daily nutrient needs or a must-have post-workout refuel that can be taken ideally within 45 minutes of exercise.

Directions: Add up to 40g (4 scoops) to 250-350ml of water or milk and shake. Adjust amount of liquid for your desired level of sweetness and thickness. Best served cold. Can also be used to make smoothies, mixed into your porridge, cornflakes or yoghurt, or baked into healthy snacks.

Works Well With: The Innermost Shaker Bottle. Our 600ml Tritan plastic, BPA-free, multi-purpose shaker bottle. Screw top lid, carry handle and stainless steel whisking ball.

Giving Back

For every purchase you make with Innermost, we will donate a meal to a child in need.

Innermost is proud to partner with The Akshaya Patra Foundation to provide better nutrition, education and employment levels and end the poverty cycle in India. Learn more here.

Better hair, skin, nails and muscle
Protein is made up of amino acids, which are the building blocks of all cells in our bodies and help support stronger hair, skin, nails and muscle.
Promotes healthy and sustainable fat loss
Acetyl l-carnitine supports the process of breaking down fat for energy, whilst inulin encourages the growth of good bacteria, which can be linked to lower levels of fat.
High in protein, low in calories
Satiating whey protein keeps you feeling fuller for longer without a high calorie content, whilst one serving boasts one of the highest protein contents in the market, with no added sugar.
Great tasting
The most delicious whey protein around. You’ll probably be coming back for seconds. Have it in smoothies, porridge, baked goods, or on its own.

User trials

*Results based on 68 participants surveyed over a 30 day period. Participants were requested to log a diary and complete a survey at the end of the month.

Everyone needs to lose weight…

Give us a break!

The first question everyone should ask themselves is why do you want to lose weight and will it benefit your health? If you're not happy with your answers to those questions, this may not be the best product for you. Don’t fall into the trap of equating weight-loss to happiness, and don’t believe anyone that tells you different.

That said, a recent survey found that almost half of UK adults had tried to lose weight in the last year, so we know this is one of the biggest concerns people had. If you’re in that camp, we understand. It’s ok to want to lose fat, albeit in a healthy, controlled way. No fad diets, no restrictions, no nonsense.

Formulated by leading nutritionists, The Lean Protein is a genuinely delicious protein powder that is the perfect partner to help you get lean, tone up, and lose body fat, alongside a sensible diet and workout routine. Because your goals are achievable.

Is this a meal replacement?

Our protein blends are not designed to be consumed as a meal replacement, but instead as a healthy addition to a balanced diet. They’re great as a midday refuel - or just whenever you’re feeling peckish! If you’re looking for something filling that keeps you going until your next meal, consider blending up a protein smoothie with some healthy fruit and vegetables. Sign-up to our email newsletter and we’ll send over some recipes.

How often should I take it?

At Innermost we believe in a food-first approach. For that reason, we recommend taking The Lean Protein as part of a balanced diet any time during your day as a healthy snack to meet your protein needs. You should always aim to meet most of your nutrient needs through the food you eat but having a high-quality protein powder like The Lean Protein, which contains additional ingredients to support your goals can be an efficient way to help fill gaps in your diet.

Does it have a complete amino acid profile?

Yes! The Lean Protein provides a complete amino acid profile per serving as follows: Leucine (2.9g), Isoleucine (1.9g), Valine (1.8g), Alanine (1.6g), Arginine (0.7g), Aspartic Acid (3.4g), Cystine (0.7g), Glutamic Acid (5.5g), Glycine (0.4g), Histidine (0.5g), Lysine (2.8g), Methionine (0.7g), Phenylalanine (0.9g), Proline (1.7g), Serine(1.5g), Threonine (2.0g), Tryptophan (0.4g), Tyrosine (0.7g). 

Will The Lean Protein make me bulky?

No! ‘Bulkiness’ is a result of continuous muscle training usually employing heavy weights and a specific high-calorie diet, and can take a lot of effort and time. In reality, protein keeps you fuller for longer so it can actually help you get more toned and defined alongside a sensible diet and physical activity.

Why should I believe this product will work?

All our products have been formulated by expert nutritionists using science-backed research supported by peer-reviewed clinical trials. You can read some of these clinical studies by clicking here. Our products work because we focus on the following things above all else - the ingredients we use, the quality of these ingredients, their concentrations and how well they're absorbed by your body. Our unwavering commitment to that approach means what you get are the highest quality, cleanest supplements in the world today - without any BS.

Nutrient heavy and evidence-based products, rather than pure fluff. The Lean Protein features inulin, a substance linked to lower levels of visceral fat (the killer kind...), along with high quality protein to aid muscle repair and recovery, yerba mate for energy, and pomegranate and bilberries for an antioxidant rush. Basically, a research based post-workout beverage of dreams.

Science over hype

With so many “miracle” ingredients being touted out there, it can be hard to know what really works. We believe evidence-based ingredients are the best way to better health. With decades of clinical studies behind these active ingredients showing how they can help reduce cravings, encourage sustainable fat-loss, support muscle repair and speed up recovery, we're confident that you’ll thank us later.

Per Serving:


Protein (29g): The building block of bones, muscles, hair, skin, and nails, this blend of dairy-based whey concentrate and isolate contains all the essential amino acids your body needs for repair, recovery and muscle development. References >1, 2.



Inulin (1g): Advanced research in weight management emphasises recognising the importance of our gut as a metabolic organ. Inulin is a prebiotic fibre that encourages growth of good gut bacteria linked to lower levels of fat. References > 3, 4.


Acetyl L-Carnitine

Acetyl L-Carnitine (750mg): A non-essential amino acid necessary for transporting fat to the body’s power-generating mitochondria. Without it, we wouldn’t be able to use fat effectively as a source of energy, which could result in the body having to break down muscle instead. References > 5, 6.



Pomegranates (500mg): This fruit has sparked interest in recent years largely due to its punicalagin and ellagic acid content. These compounds are retained in the gut where they encourage the growth of good gut bacteria linked to lower levels of fat. References > 7, 8.


Yerba Mate

Yerba Mate (500mg): Dried leaves of an evergreen holly tree native to South America. An incredibly high antioxidant content and has been shown to have possible effects in the area of weight management, which could be due to it helping delay intestinal absorption of dietary fat. References > 9, 10.



Bilberries (250mg): Belonging to a class of natural bioactives with wide-reaching health benefits, including improving cardiovascular health, glucose control and inflammation. These dark berries are rich in antioxidants and resveratrol, which are seeing increased use for their purported anti-aging properties. References > 11, 12.

Learn More:  Your Gut Could Hold The Secret To Getting Leaner
Learn More:  Here's How Protein Can Help You Lose Weight And Achieve Your Fitness Goals

Be the best version of you


Protein is a macronutrient that’s necessary for healthy muscles, skin, nails and bones. Whey protein concentrate and isolate are loaded with the essential amino acids that your body needs to function efficiently. As a high-quality source of protein, whey also lowers blood pressure, decreases inflammation and reduces cravings.


Pomegranates, yerba mate, bilberries and inulin are active ingredients that provide wide-reaching health benefits. Inulin and pomegranates have properties that encourage the growth of good bacteria, while bilberries and yerba mate are rich in antioxidants. These bioactives have been shown to positively affect weight management through their different properties.

Functional Ingredients

Acetyl l-carnitine is functional for both your physical and mental health. By transporting fatty acids to the mitochondria, the supplement is effective when it comes to improving memory, increasing endurance and reducing fatigue. It allows your body to burn fat for energy, so that your workouts are optimised for muscle health and development.

When should I use the product?

Anytime during the day as a healthy snack to meet your protein needs! However, you can also use it to make a quick nutritious shake or smoothie anytime of the day, or in your porridge or oatmeal to top up your daily protein intake. The protein blend is also versatile enough to bake into high-protein snacks.

How long will the product last?

This depends on how often you use the product. Typically a pouch of our protein blends will last around a month or so. If you're using it every day and also adding it to porridge and smoothies, you may run out sooner. We have a subscription option, which saves you money and ensures you'll never run out.

What does it taste like?

All our protein blends come in either creamy vanilla or smooth chocolate. We spent months perfecting the flavour systems to create our own completely custom flavours that you won't get anywhere else. The flavours are characterised by complex layers of vanilla and cocoa, with subtle notes of caramel and biscuit. We only use natural flavours and you can adjust the sweetness down or up by using more or less liquid.

What sort of testing do you do?

We go over and above to ensure you get the best quality and safest products possible. We only use ingredients that have a visible supply chain, and our manufacturing facilities are approved to the highest regulatory standards. Once we receive ingredients, we batch test every single one before it gets approval to go into the manufacturing process. That isn’t technically an official requirement but it’s something that we think should be.

Ready To Buy

Real People, Real Results

We reached out to the Innermost community to get their honest feedback on The Lean Protein. This is what Charlotte had to say...

1 week
1 month
3 months

Customer Feedback

Customer Reviews

Based on 4 reviews
Great taste

First time trying this product. It blends very well. I use it for my smoothies and I'm really enjoying it. Would re-purchase!

Protein in smoothies is a win! Thank you for the review Agnes.

Joanne Taylor

I've been so impressed with all Innermost products. I wanted to try the chocolate flavour, and I wasn't disappointed. Not at all grainy and bitter like many other brands.

Thanks for the kind review Joanne! We take a lot of pride in our perfected taste and texture.

Ursula Fisher
Trial pack Lean protein vanilla

These are really handy for on the go shakes, I can take a portion with me and add straight into my innermost shaker when I’m ready for my shake. Tastes great and works wonders, win/win

Genius! Keep us posted on your results Ursula, we love to hear how our customers are getting on.

Hannah Brazier
Really tasty.

Great tasting vanilla protein powder. Mixes well with no lumps and the ingredients list is reassuring free of nasty additives.

Love the option to buy trial packs as buying a full size bag not knowing if you will like the product puts me off buying a lot of products.

I've already gone on to buy the full sized version.

We're so glad you loved the product! Thank you so much for the lovely review Hannah.

Ready To Buy
"Innermost protein is as smart as it is delicious."
"Known for their tailored nutrition for body and mind."
"Favoured by athletes across the globe."
"The best protein shakes for a post workout pick me up."
"Known for redefining performance supplements into cleverer supportive measures."
"You'll have to take our word that it's hands down delicious."
"Filled with all the good stuff... Oh, and it tastes great too."