{"product_id":"optimum-nutrition-on-serious-mass-gainer-powder","title":"OPTIMUM NUTRITION (ON) Serious Mass Gainer powder","description":"\u003cdiv class=\"product-tabs\"\u003e\n  \u003ch2\u003eAbout the Product\u003c\/h2\u003e\n\n  \u003c!-- TAB BUTTONS --\u003e\n  \u003cdiv class=\"tab-buttons\"\u003e\n    \u003cbutton class=\"tab-btn active\" data-tab=\"description\"\u003eDescription\u003c\/button\u003e\n    \u003cbutton class=\"tab-btn\" data-tab=\"benefits\"\u003eKey Benefits\u003c\/button\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- DESCRIPTION --\u003e\n  \u003cdiv class=\"tab-content active\" id=\"description\"\u003e\n    \u003cdiv class=\"desc-container\"\u003e\n      \u003cp\u003e\u003cstrong\u003eOptimum Nutrition Serious Mass\u003c\/strong\u003e is the ultimate high-calorie weight gain and muscle-building formula. Designed for those aiming to increase size and strength, it delivers approximately \u003cstrong\u003e1251 calories*\u003c\/strong\u003e per serving (varies by flavor) and \u003cstrong\u003e50 grams of blended protein\u003c\/strong\u003e to support recovery and muscle growth.\u003c\/p\u003e\n      \u003cp\u003eThis vegetarian-friendly formula includes a powerful combination of carbohydrates, proteins, and essential nutrients to fuel muscle development. It also contains \u003cstrong\u003eCreatine Monohydrate, L-Glutamine, and 24 vitamins and minerals\u003c\/strong\u003e for complete nutritional support.\u003c\/p\u003e\n      \u003cp\u003eWhether used post-workout or between meals, Serious Mass provides a convenient and effective way to boost your calorie intake and achieve your physique goals.\u003c\/p\u003e\n      \u003ch3\u003eHighlights\u003c\/h3\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHigh-Calorie Formula:\u003c\/strong\u003e Delivers 1251 calories* per serving (flavor-dependent).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eProtein-Rich:\u003c\/strong\u003e 50g of blended protein from vegetarian sources.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCarbohydrate Power:\u003c\/strong\u003e Over 250g of complex carbs with no added sugar.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAdded Nutrients:\u003c\/strong\u003e Creatine, Glutamine, Glutamic Acid, and MCTs for sustained energy and recovery.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMicronutrient Support:\u003c\/strong\u003e Contains 24 essential vitamins and minerals.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePremium Quality:\u003c\/strong\u003e Manufactured in NSF GMP-registered facilities following strict quality standards.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp class=\"note\"\u003e*Calorie value may vary by flavor. For best results, combine with a balanced diet and consistent training.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- KEY BENEFITS --\u003e\n  \u003cdiv class=\"tab-content\" id=\"benefits\"\u003e\n    \u003cdiv class=\"benefits-container\"\u003e\n      \u003ch3\u003eWhy Choose Serious Mass?\u003c\/h3\u003e\n      \u003cul class=\"benefits-list\"\u003e\n        \u003cli class=\"benefit-item\"\u003e\n\u003cstrong\u003eMassive Calorie Boost:\u003c\/strong\u003e Provides the high caloric intake needed to support extreme muscle gain and recovery.\u003c\/li\u003e\n        \u003cli class=\"benefit-item\"\u003e\n\u003cstrong\u003eMuscle Growth Support:\u003c\/strong\u003e 50g of quality protein fuels muscle repair and lean mass development.\u003c\/li\u003e\n        \u003cli class=\"benefit-item\"\u003e\n\u003cstrong\u003eBalanced Nutrition:\u003c\/strong\u003e Contains carbohydrates, proteins, healthy fats, and micronutrients for complete muscle nourishment.\u003c\/li\u003e\n        \u003cli class=\"benefit-item\"\u003e\n\u003cstrong\u003eVegetarian Friendly:\u003c\/strong\u003e 100% vegetarian protein blend suitable for diverse diets.\u003c\/li\u003e\n        \u003cli class=\"benefit-item\"\u003e\n\u003cstrong\u003eEnhanced Performance:\u003c\/strong\u003e With Creatine and Glutamine to boost strength and recovery.\u003c\/li\u003e\n        \u003cli class=\"benefit-item\"\u003e\n\u003cstrong\u003eTrusted Quality:\u003c\/strong\u003e Backed by Optimum Nutrition’s commitment to excellence and NSF GMP certification.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp class=\"note\"\u003eSerious Mass is designed for athletes and hard gainers who need extra calories and nutrients to reach their physique and performance goals.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n  .product-tabs {\n    font-family: \"Poppins\", Arial, sans-serif;\n    max-width: 900px;\n    margin: 40px auto;\n    padding: 0 16px;\n    color: #222;\n  }\n\n  .product-tabs h2 {\n    font-size: 1.7rem;\n    font-weight: 700;\n    text-align: center;\n    margin-bottom: 18px;\n  }\n\n  \/* TAB BUTTONS *\/\n  .tab-buttons {\n    display: flex;\n    justify-content: center;\n    background: #fff;\n    border: 1px solid #e0e0e0;\n    border-radius: 12px;\n    overflow: hidden;\n    box-shadow: 0 2px 10px rgba(0,0,0,0.05);\n    margin-bottom: 25px;\n    position: sticky;\n    top: 10px;\n    z-index: 20;\n  }\n\n  .tab-btn {\n    flex: 1;\n    padding: 12px 16px;\n    border: none;\n    background: #fff;\n    color: #333;\n    font-weight: 600;\n    font-size: 0.95rem;\n    cursor: pointer;\n    transition: all 0.3s ease;\n  }\n\n  .tab-btn.active {\n    background: linear-gradient(90deg, #000, #333);\n    color: #fff;\n    box-shadow: inset 0 -2px 0 #ffcc00;\n  }\n\n  .tab-btn:not(:last-child) {\n    border-right: 1px solid #e0e0e0;\n  }\n\n  \/* TAB CONTENT *\/\n  .tab-content {\n    display: none;\n    animation: fadeIn 0.4s ease;\n  }\n\n  .tab-content.active {\n    display: block;\n  }\n\n  .desc-container,\n  .benefits-container {\n    background: #fff;\n    padding: 24px;\n    border-radius: 12px;\n    box-shadow: 0 3px 10px rgba(0,0,0,0.08);\n  }\n\n  h3 {\n    font-size: 1.2rem;\n    margin-top: 16px;\n    margin-bottom: 10px;\n    color: #111;\n  }\n\n  ul {\n    padding-left: 20px;\n    list-style: disc;\n  }\n\n  li {\n    margin-bottom: 10px;\n    line-height: 1.6;\n  }\n\n  .benefits-list {\n    list-style: disc;\n    padding-left: 20px;\n  }\n\n  .benefit-item {\n    margin-bottom: 10px;\n  }\n\n  .note {\n    font-size: 0.9rem;\n    color: #555;\n    margin-top: 12px;\n    font-style: italic;\n  }\n\n  @keyframes fadeIn {\n    from { opacity: 0; 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