{"product_id":"optimum-nutrition-on-serious-mass-gainer-3kg","title":"Optimum Nutrition (ON) Serious Mass Gainer 3kg","description":"\u003cp\u003e\u003cspan style=\"color: rgb(47, 117, 49);\"\u003e\u003cstrong\u003eOptimum Nutrition Serious Mass is a premium weight gain formula designed for athletes and fitness enthusiasts looking to build muscle mass efficiently. Each serving delivers 1,250 calories with 50g of protein, supporting muscle growth and recovery after intense workouts. This gainer features a blend of fast and slow-digesting carbohydrates that provide sustained energy, along with 25 essential vitamins and minerals for overall health. The formula includes creatine monohydrate to enhance strength and performance during training sessions. With a smooth, creamy taste available in multiple flavors, Serious Mass mixes easily and can be consumed post-workout or between meals as a convenient calorie boost. Ideal for hardgainers and those with high metabolic demands, it helps you achieve your mass-building goals while supporting muscle recovery and development.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"OPTIMUM NUTRITION","offers":[{"title":"CHOCOLATE","offer_id":67381704032301,"sku":null,"price":4099.0,"currency_code":"INR","in_stock":true},{"title":"VANILLA","offer_id":67381704065069,"sku":null,"price":4099.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0768\/7962\/6285\/files\/Screenshot_2026-08-20_100849.png?v=1787200747","url":"https:\/\/proteindoor.com\/products\/optimum-nutrition-on-serious-mass-gainer-3kg","provider":"ANGIRASH FITNESS","version":"1.0","type":"link"}