MaxiNutrition Progain Extreme Mass + Size Chocolate Flavour 1.5kg


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Why Progain Extreme?

Take your mass and size goals to the next level by using Progain Extreme. Training to further increase mass and size requires the right nutrition, including an increase in protein intake. Progain Extreme provides 40g of protein in every serving using fast acting and slow release proteins.

Every serving of Progain Extreme provides 600 calories, 3g calcium HMB and 40g of high-quality protein for gains in muscle size. It also naturally contains 9.9g of BCAAs and 7.9g of glutamine per serving. If you are making an attempt to achieve your peak size, Progain Extreme contains the extra nutrition that will help you get you there effectively.

Suitable for vegetarians.

How to use

Promax Extreme

On the days you train - 1 serving after training + Another mid-morning or mid-afternoon.

On the days you don't train - 1 Serving mid-morning or 1 Serving mid-afternoon.

How to Serve

  • 2 Scoops
  • Shake with Water
  • Drink

Drink one serving a day in between meals. On days you're training, drink one after your session. If you need more protein and calories in your diet, increase to two servings per day. For one serving, add two and a half scoops of powder (about 150g) to 500ml of water, shake to blend and enjoy!

Do not exceed the recommended daily intake.


Keep tightly sealed in a cool, dry place and away from direct sunlight.

For best before end see back of pack.

Hazards and Cautions

Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.

Do not exceed the recommended daily intake. Keep out of reach of children.

While every care has been taken to ensure this information is always as accurate as possible, food products are regularly improved and nutrition content may occasionally change. As a result we recommend that you always read the label carefully before using or consuming any products. Nutritional Reference Value (NRV) information is based on the typical composition of the product. Guideline daily amounts are those for a typical adult (men and women).NRV information for non Boots products is calculated by the manufacturer. Boots has no control over the recipe or nutritional content of such products and information on this site may differ to that given on the product label. We would therefore recommend you do not solely rely on this information and always read the product label. If you have any queries, or you would like advice on Boots products please contact our friendly Customer care team on 0345 609 0055.

This information was last updated 03/12/2015.

Important info

Benefits of Progain Extreme

High in Protein

Using the latest in cutting edge protein science, Progain Extreme contains our triple release protein formula that provides an impressive 40g of protein per serving for gains in muscle size.

Our formula contains fast acting and slow release proteins to elevate amino acid levels in the blood for longer. Protein is scientifically proven to support gains in muscle size.

Naturally Rich in BCAAs & Glutamine

Our protein formula naturally contains 9.9g of Branched Chain Amino Acids (BCAAs) in every serving, which includes 4.5g of the key amino acid, leucine. These amino acids are a crucial part of your diet because your body can't make them itself. Every serving also naturally contains 7.9g of glutamine, the most abundant amino acid in muscle.

600 Calories

Progain Extreme contains a massive 600 calories, with 160 calories from 40g of muscle-building proteins in every serving. We have also packed every serving with 76g of complex carbohydrates including oats. When you're training hard for mass and size, add Progain Extreme to your diet - the additional calories and 40g of protein will help to maximise gains in muscle mass and size.

3g Calcium HMB

Every serving provides an impressive 3g of calcium HMB, a metabolite of the essential branched chain amino acid leucine. HMB is a well-researched ingredient and recommended by industry-leading experts.

Source of Fibre

Every serving provides a source of fibre, a key component of a healthy, balanced diet.

Screened and Effective

Every batch of Progain Extreme is a screened for banned substances and is a registered with the Informed-Sport programme.

Scientifically developed to increase muscle mass and size. Fast acting slow release - proteins

  • Performance protein
  • High in protein
  • Protein supplement
  • Source of fibre

Country of Origin - Product of the EU

Manufacturers Address: MaxiNutrition, GSK House, Brentford, TW8 9GS.


Maltodextrin, Whey Protein Concentrate (Milk), Milk Protein Concentrate, Isolated Soya Protein (contains Emulsifier: Soya Lecithin), Cocoa Powder (6%), Oat Flour (5%), Soya Oil Powder, Medium Chain Triglycerides, Calcium Hydroxy Methylbutyrate, Fructooligosaccharide (1%), Flavourings, Thickener (Cellulose Gum), Sodium Chloride, Sweeteners (Sucralose, Acesulfame K)

Allergy Advice: please see ingredients in bold.

Nutritional Information

Per 100g Serving Per 150g Serving
Energy (kJ/kcal) 1673 / 400 2510 / 600
Fat (g) 8.4 13.0
of which saturates (g) 4.6 7.0
Carbohydrates (g) 50.9 76.0
of which sugars (g) 4.1 6.0
Fibre (g) 3.0 5.0
Protein (g) 26.7 40.0
Salt(g) 0.8 1.1 more less

Delivery options

Order & Collect
€2.50 or free if you spend €25 or more from your choice of 85 Boots stores

Standard Delivery
€5 or free when you spend €50 or more

For more information see our delivery help or view our returns policy.

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