Reflex Nutrition Instant Mass Heavyweight is a premium mass gainer shake designed specifically for hard gainers and athletes who train intensely but struggle to consume enough calories and protein through food alone. Each serving provides a high amount of protein, carbohydrates, and calories.

Mix 300g with 700ml of water in a shaker cup or blender and mix until smooth. For precise measurements, using weighing scales is recommended as the scoops measure in millilitres rather than grams. The shake can also be mixed with skimmed milk to increase the calorie and protein content further, depending on your individual goals.

Each 300g serving provides approximately 18 servings from the 5.4kg tub. Instant Mass Heavyweight is also available in a 2kg tub providing approximately 6 serving, a practical option for those trying the product for the first time before committing to the larger size.

Yes, you have the right to cancel your order within 14 days from the date you receive your items, without needing to give a reason.

You have 14 days from the date of delivery to cancel your order under your cooling-off period rights. This allows you to change your mind about your purchase and return the item, provided it is unused and in its original, resellable condition.

To arrange a return or refund, please contact our Customer Service team via email on info@reflexnutrition.com or call 01273 303817 with your order number and delivery address, and we will guide you through the next steps.

Yes, return shipping is your responsibility to arrange and pay for.

If a delivery fails or you don't collect your parcel and it comes back to us, additional charges may apply.

Refunds go back to your original payment method once we've received and processed your return. Timings vary by payment provider; your bank or card issuer will confirm the exact date.

If there is an issue with your order, please contact our Customer Service team via email info@reflexnutrition.com or call 01273 303817 with your order number and delivery address as soon as possible so we can investigate and resolve the issue.

Items must be unused and in their original, resellable condition, exactly as you received them. Pack them securely in appropriate packaging to protect them in transit.

We can't accept returns that arrive damaged due to poor packaging.

We are unable to accept returns for certain items where it would not be suitable for resale, such as products that have been opened, used, or are not in a resellable condition.

If you no longer have your receipt or order confirmation, please contact our Customer Service team via email info@reflexnutrition.com or call 01273 303817 with as much information as possible (such as your name, email address, or delivery postcode), and we will do our best to locate your order.

Replacements or exchanges will be processed once your returned item has been received and inspected. Delivery times for replacements will follow standard shipping timeframes.

Yes, items purchased using a discount code or as part of a promotion can still be returned, provided they meet the returns criteria. This means items must be unused and in their original, resellable condition, exactly as you received them. Pack them securely in appropriate packaging to protect them in transit.

Our courier does not require a signature and will take a photo as proof of delivery. If no “safe place” or alternative delivery option has been selected, your parcel will be returned to the depot and reattempted the next working day. If the parcel is not redelivered or collected within 5 days, it will be returned to us and a charge may apply.

If your order arrives damaged or incorrect, please contact our Customer Service team as soon as possible with your order number, delivery address, and photos of the issue, so we can resolve this quickly.

If you believe your parcel is lost, please contact our Customer Service team with your order number and delivery address so we can investigate this with the courier.

If your order has not arrived within the expected timeframe, please check your tracking information first. If you still need help, please contact our Customer Service team quoting your order number and delivery address, and we will be happy to assist.

Once your order has been dispatched, it is not usually possible to change the delivery address. However, you may be able to update delivery preferences directly with the courier using your tracking details.

Once your order has been dispatched, you will receive an email from the courier with your tracking details and delivery updates.

Standard delivery typically takes 3–5 working days. Next working day delivery is available on eligible orders placed before 1pm Monday to Thursday.

We currently deliver within the UK, including Jersey, Guernsey, and the Isle of Man. Please note, we are unable to deliver to P.O. boxes or shipping agent addresses.

Yes, we offer free standard delivery on UK mainland orders over £50.

Standard UK mainland delivery is £4 for orders under £50, and free for orders £50 and over. Next working day UK mainland delivery is available for £6.

Instant Mass® Heavyweight is designed specifically to help increase calorie and protein intake, making it suitable for people who want to gain weight. To gain body weight, you need to consistently consume more calories than your body uses; Instant Mass® Heavyweight can make achieving a calorie surplus more convenient.

Instant Mass® Heavyweight can complement a muscle-building diet by providing 60g of protein and a high calorie intake per serving. Protein contributes to the growth and maintenance of muscle mass, while resistance training and an appropriate overall diet remain important parts of a muscle-building programme.