Which supplements help you gain weight?
What drives weight gain is a calorie surplus. If you can't eat enough, a mass gainer is convenient; mixing a carbohydrate powder with protein powder is often cheaper. Creatine supports muscle gain.
What helps, what doesn’t?
Mass gainer or carb powder (if needed)
Closes the calorie gap when food alone isn't enough. A gainer is a ready-made mix; a carb powder (cream of rice, maltodextrin) plus protein powder usually does the same for less.
Creatine monohydrate
3–5 g a daySupports muscle gain. The water stored in muscle in the first weeks usually shows up as 1–2 kg on the scale.
Protein powder
Adds protein to the surplus if you're not using a gainer or your protein target falls short.
BCAAs and EAAs
Don't close a calorie or protein gap; the same money buys more protein powder or food.
Lowest price per kilogram
We divide the pack price by its weight, so a bigger tub often comes out cheaper. Only products in stock with a known pack weight are listed, one per brand. A green badge means the price really dropped against our own 30-day price history.
Mass gainers
All mass gainers- Warrior Mass Lean Mass Gainer - 5kgWarrior5 kgSold by bodybuildingwarehouse.co.ukGo to store£8.00/kg£39.99 per pack
- Bulk 1000 Mass Gainer - 4.05kgBulk4.05 kgLowest in 30 daysGo to store£9.87/kg£39.99 per pack
From 6 eligible products, each brand’s lowest price per kg.
Carb powders
All mass gainersPlain carbohydrate sources such as cream of rice and maltodextrin, mixed with protein powder.
- Maltodextrin - 5kgBulk5 kgLowest in 30 daysGo to store£3.40/kg£16.99 per pack
- Cream Of Rice Apple Strudel - 2KgPER4M2 kgGo to store£15.00/kg£29.99 per pack
From 18 eligible products, each brand’s lowest price per kg.
Creatine
All creatine prices- Pure Creatine Monohydrate Powder - 1kgBodybuilding Warehouse1 kgSold by bodybuildingwarehouse.co.ukGo to store£14.99/kg£14.99 per pack
- Go to store£19.99/kg£19.99 per pack
- Sports Fuel Creatine Monohydrate Powder - 100g (Clearance)Sports Fuel100 gSold by bodybuildingwarehouse.co.ukGo to store£29.90/kg£2.99 per pack
- Warrior Creatine Monohydrate Powder - 300g, 500g & 1kgWarrior300 gSold by bodybuildingwarehouse.co.ukGo to store£29.97/kg£8.99 per pack
- Go to store£57.78/kg£26.00 per pack
- Enervit Sport - Creatine monohydrate powder - 330 gEnervit330 gSold by 365rider.comGo to store£58.18/kg£19.20 per pack
From 48 eligible products, each brand’s lowest price per kg.
Frequently asked questions
Mass gainer or protein powder?
If you struggle to gain weight, what's usually missing is calories; a gainer gives calories and protein together. If you already hit your protein target, a carb powder is the cheaper route.
Will a mass gainer make me fat?
A gainer is just calories. Calories beyond your needs are stored as fat whatever the source. Gaining about 0.25–0.5 kg a week is a sensible pace for most people.
Does creatine help you gain weight?
Creatine supports muscle gain and adds 1–2 kg of water weight in the first weeks. It doesn't replace a calorie surplus.