Optimum Nutrition Serious Mass Gainer 6Lb

Optimum Nutrition Serious Mass 6lb — High-Calorie Gainer, Smaller Tub

Same formula as the 12lb, in a size that's easier to commit to. Each full serve delivers over 1,250 calories, 50g of protein from whey, casein and egg, and 250g+ of carbohydrate, with creatine, glutamine and 25 vitamins and minerals. Around 8 full serves per tub. In stock at TopDog Nutrition.

Why Start With the 6lb

Gainers are a bigger commitment than they look. Drinking 1,250 calories in one sitting doesn't suit everyone, and the only way to find out how your stomach handles it is to try.

The 6lb is the low-risk version of that decision. Around 8 full serves, or 16 at the half-serve most people should start on. Enough to know whether the flavour, the texture and the calorie load work for you before buying a 12lb tub.

It also suits anyone using a gainer occasionally rather than daily — a half serve after training on hard days, rather than a full serve as a standing habit.

The Formula

• 1,250+ calories per serve — the calorie gap-closer for anyone who can't eat enough whole food to gain.
• 50g protein from whey, casein and egg — three sources with different digestion speeds, giving a longer amino acid release than any single protein.
• 250g+ carbohydrate — bulk calories plus glycogen replenishment, and the insulin response that drives amino acids into muscle.
• Creatine — supports ATP regeneration for strength and power output.
• Glutamine — supports recovery and gut function, which matters when you're pushing a lot of food through daily.
• 25 vitamins and minerals — covers the micronutrient gaps that calorie-dense bulking diets tend to leave.

Directions

Blend 2 scoops with 700ml of water. Use a blender rather than a shaker — this is a large volume of powder and it mixes far better with a blade.

Start on half a serve. Full dose on day one usually ends in bloating and a skipped second day. Build up over a week or two as your digestion adapts.

Take between meals or after training, not instead of meals. A gainer is what goes on top of eating properly.

Allergens

Contains milk, egg and soy. Check the label for flavour-specific allergen information.

Frequently Asked Questions

How many serves in the 6lb?

Around 8 full serves, or 16 half serves.

Is the formula the same as the 12lb?

Identical. Only the tub size and the price per serve differ.

Do I need a gainer at all?

Only if you genuinely can't eat enough. If you can hit a surplus with food, do that — it's cheaper and more nutritious. Gainers solve an appetite problem, not a training one.

Can I mix it with milk?

Yes, and it pushes the calories and protein higher. Worth doing if water-mixed still isn't getting you gaining.

How fast should I be gaining?

Roughly 0.25–0.5kg a week is a sensible rate for gaining mostly muscle. Faster than that and you're adding more fat than you need to. Adjust the serve size to hit that rate rather than drinking a full serve regardless.