{"product_id":"optimum-nutrition-on-serious-mass-1kg","title":"Optimum Nutrition (ON) Serious Mass 1kg","description":"\u003cp\u003e\u003cspan style=\"color: rgb(40, 119, 62);\"\u003e\u003cstrong\u003eOptimum Nutrition Serious Mass is a high-calorie weight gainer designed to support muscle growth and recovery. Each serving delivers a blend of whey protein, carbohydrates, and essential nutrients to fuel intense workouts and promote lean mass gains. With 1250 calories per serving, it's ideal for athletes and fitness enthusiasts looking to increase daily caloric intake in a convenient, delicious format. Mix with milk or water for a quick, nutrient-dense shake that supports your training goals.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"OPTIMUM NUTRITION","offers":[{"title":"Default Title","offer_id":67381648556077,"sku":null,"price":1499.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0768\/7962\/6285\/files\/Screenshot2026-08-20100001.png?v=1787200215","url":"https:\/\/proteindoor.com\/products\/optimum-nutrition-on-serious-mass-1kg","provider":"ANGIRASH FITNESS","version":"1.0","type":"link"}