Head to head
GNC vs Optimum Nutrition
Values use the dated retailer prices shown below. Older prices are labelled as last verified; delivery and checkout totals may differ. Cost calculations use net weight and serving size, not rounded serving counts.
GNC
GNC Pro Performance Weight Gainer
3 Kg · Double Chocolate
₹2,299
Lowest checked price · 3 current prices
Price checked 14/9/2026, 3:05:10 am IST
₹7.43/g protein
Optimum Nutrition
Optimum Nutrition Serious Mass
3 Kg · Chocolate
₹4,099
Lowest checked price · 3 current prices
Price checked 14/9/2026, 3:07:22 am IST
₹9.13/g protein
The verdict
GNC Pro Performance Weight Gainer is the better value at ₹7.43 per gram of protein.
The numbers, side by side.
Lower is better for cost, higher for protein content. GNC Pro Performance Weight Gainer: manufacturer verified · Optimum Nutrition Serious Mass: catalog label data.
| Metric | GNC Pro Performance Weight Gainer | 3 Kg | Double Chocolate | Optimum Nutrition Serious Mass | 3 Kg | Chocolate |
|---|---|---|
| Checked listing price | ₹2,299 | ₹4,099 |
| Cost per gram of protein | ₹7.43 | ₹9.13 |
| Cost per gram | ₹0.77 | ₹1.37 |
| Cost per serving | ₹371.67 | ₹456.36 |
| Protein per ₹100 | 13.45 g | 10.96 g |
| Protein per serving | 50 g | 50 g |
| Protein by weight | 10.31 % | 14.97 % |
| Pack size | 3,000 g | 3,000 g |
| Declared servings per pack | 6 | 9 |
| Energy | 1860 kcal | 1243 kcal |
| Protein | 50 g | 50 g |
| Carbohydrates | 405 g | 254 g |
| Total fat | 4.5 g | 3 g |
| Saturated fat | 2.52 g | Not listed |
| Trans fat | 0 g | Not listed |
| Added sugar | 0 g | Not listed |
| Dietary fibre | 5 g | Not listed |
| Calcium | 500 mg | 571 mg |
| Sodium | 435 mg | 544 mg |
| Potassium | 500 mg | Not listed |
| of which sugars | Not listed | 20 g |
| of which saturated | Not listed | 2 g |
| of which trans | Not listed | 0 g |
| Cholesterol | Not listed | 144 mg |
| Creatine monohydrate | Not listed | 3 g |
| Protein source | Not listed | Whey Protein Concentrate, Calcium Caseinate |
| Carbohydrate source | Not listed | Maltodextrin |
Where to buy
GNC Pro Performance Weight Gainer | 3 Kg | Double Chocolate
Lowest verified price
Listed in stock
Checked 14 Sept 2026, 3:05 am IST
Retailer listing; confirm delivery and final total at checkout
Listed in stock
Checked 14 Sept 2026, 3:06 am IST
Retailer listing; confirm delivery and final total at checkout
Listed in stock
Checked 14 Sept 2026, 3:05 am IST
Retailer listing; confirm delivery and final total at checkout
Last verified
Last seen out of stock
Last verified 7 Sept 2026, 1:04 pm IST
Deferred 14 Sept 2026, 3:05 am IST
Check deferred because this store restricts automated price checks
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Last attempted 14 Sept 2026, 3:05 am IST
No reliable product price was readable
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Last attempted 14 Sept 2026, 2:10 am IST
Retailer page could not be verified
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Deferred 14 Sept 2026, 3:05 am IST
Check deferred because this store restricts automated price checks
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Deferred 14 Sept 2026, 3:05 am IST
Check deferred because this store restricts automated price checks
Pack or flavour could not be matched
Price source unavailable
Last attempted 14 Sept 2026, 3:05 am IST
Pack, flavour or product identity could not be matched
Where to buy
Optimum Nutrition Serious Mass | 3 Kg | Chocolate
Lowest verified price
Listed in stock
Checked 14 Sept 2026, 3:07 am IST
Retailer listing; confirm delivery and final total at checkout
Lowest verified price
Listed in stock
Checked 14 Sept 2026, 3:05 am IST
Retailer listing; confirm delivery and final total at checkout
Listed out of stock
Checked 14 Sept 2026, 3:06 am IST
Retailer listing; confirm delivery and final total at checkout
Last verified
Last seen in stock
Last verified 7 Sept 2026, 1:06 pm IST
Deferred 14 Sept 2026, 3:05 am IST
Check deferred because this store restricts automated price checks
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Deferred 14 Sept 2026, 3:05 am IST
Check deferred because this store restricts automated price checks
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Last attempted 14 Sept 2026, 3:06 am IST
No reliable product price was readable
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Last attempted 14 Sept 2026, 2:21 am IST
Retailer page could not be verified
Catalog price
Catalog price · confirm availability and final total with the retailer
Catalog snapshot 6 Sept 2026, 9:06 pm IST
Last attempted 14 Sept 2026, 3:07 am IST
Conflicting retailer prices