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    Optimum Nutrition Serious Mass weight gainer - Vanilla flavour, 2.73kg
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Optimum Nutrition

Optimum Nutrition Serious Mass (2.73kg)

Optimum Nutrition Serious Mass (2.73kg)

£46.99
£46.99
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Delivery

We deliver UK-wide via DPD. Free UK Delivery on orders over £50, £3.99 otherwise.

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Returns

Returns & Refunds Policy

Last updated: 12/07/2026
Your right to cancel
Under UK Consumer Contracts Regulations, you have the right to cancel your order within 14 days of receiving it, without giving a reason.
Important — supplement-specific exception
Because our products are consumable and relate to health, once a product’s seal or packaging has been opened or broken, we are unable to accept it back for hygiene and safety reasons, unless the product is faulty or not as described. 
How to return an unopened item
1. Email info@renewedperformance.co.uk within 14 days of receiving your order, including your order number.
2. We’ll confirm the return address and process.
3. Items must be unopened, unused, and in original packaging.
4. You are responsible for return postage costs unless the item is faulty or incorrect.
Refunds
Once we’ve received and inspected your return, we’ll process your refund to your original payment method within 14 days. Original delivery charges are non-refundable unless the return is due to our error.
Faulty or incorrect items
If you receive a faulty, damaged, or incorrect item, contact us within 48 hours of delivery with photos where possible, and we’ll arrange a replacement or full refund, including return postage.
Contact
info@renewedperformance.co.uk

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A high-calorie weight gainer built for anyone who struggles to eat enough to build size — 1250 calories and 50g protein per serving to support serious mass gains.

Why choose Serious Mass

  • 1250 calories per serving — genuinely built for weight gain, not a light snack
  • 50g protein per serving — supports muscle growth alongside the calorie surplus
  • 2.73kg tub — 8 servings to build size

Nutritional information (per 334g serving)

Calories: 1250 | Protein: 50g | Carbohydrates: 252g (of which sugars: 20g) | Fat: 4.5g (of which saturates: 1.5g).

How to use

Mix 2 scoops with 600-750ml of cold water or milk. Use between meals to add calories without needing to eat more solid food.

Frequently asked questions

Who is Serious Mass actually for?
Anyone who struggles to eat enough calories to gain weight or size through food alone — often called "hardgainers." It's not intended for people already eating a calorie surplus.

Do I need to drink a full serving at once?
Not necessarily — some people split it into smaller portions throughout the day if 1250 calories in one sitting feels like too much.

Can I use this alongside regular meals?
Yes — it's designed as an addition between meals to boost total daily calories, not a meal replacement.

Best before: 2 April 2028*

*Based on current stock — exact date may vary slightly.

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