{"@context":"https://schema.org","@type":"Product","name":"Rule One Mass Gainer","image":["https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Rule_1_Mass_Gainer_8_Servings_CPP.jpg?v=1766072014","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/R1_Mass_Gainer_8_Servings_CPP_Supplement_Facts.jpg?v=1766071953","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Side_Bottle.jpg?v=1766072186","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/mass-gainer_5lb_chocolate-fudge_front.webp?v=1766072186","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Rule_1_Mass_Gainer_8_Servings_Cookies_n_Cream.jpg?v=1766072186","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/R1_Mass_Gainer_8_Strawberries_Creme.jpg?v=1766072186","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/r1_Mass_Gainer_8_Vanilla_Creme.jpg?v=1766072186","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Rule_1_Mass_Gainer.jpg?v=1766072077","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Chocolate_Peanut_Butter_Supplement_Facts.jpg?v=1766072125","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Chocolate_Fudge_Mass_Gainer_Rule_1.jpg?v=1766072134","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Cookies_Creme_Rule_1.jpg?v=1766072147","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/Strawberries_Creme.jpg?v=1766072161","https://cdn.shopify.com/s/files/1/0133/8576/0826/files/r1MassGainerVanilla.jpg?v=1766072171"],"description":"

Build size and strength with Rule One Mass Gainer, a high calorie muscle building formula designed for hard gainers and athletes looking to increase mass. Each serving delivers a powerful blend of quality protein, carbohydrates, and calories to support muscle growth, strength gains, and recovery.

Mass Gainer is ideal for those who struggle to consume enough calories through food alone. Whether you’re bulking, training hard, or trying to increase overall body weight, this formula helps fuel intense workouts and supports consistent progress toward your size goals.

Perfect for post-workout shakes or between meal calorie support, Rule One Mass Gainer makes it easier to stay in a calorie surplus and build lean mass efficiently.

Key Benefits

Supports muscle mass and weight gain\n
High calorie formula for hard gainers\n
Delivers protein and carbohydrates to fuel growth
Helps support recovery and workout performance\n
Easy to mix powder for convenient calorie intake
Ideal for bulking and strength focused training programs

Why Choose Rule One Mass Gainer

Designed for athletes and hard gainers
Helps maintain a calorie surplus
Can be used post-workout or between meals
Quality driven formulation from Rule One

How to Use

Mix 1 serving with water or milk. Consume post-workout or between meals to help meet daily calorie and protein needs. Adjust serving size based on individual goals and caloric requirements.

Product Highlights

\n
High calorie mass gainer supplement
\n
\n
Supports size, strength, and muscle growth
\n
\n
Multiple flavor options available
\n
\n
Trusted Rule One quality
\n

$\"\"$

","brand":{"@type":"Brand","name":"R1"},"category":"Vitamins & Supplements","dateModified":"2026-05-11T15:15:39.868563","offers":{"@type":"AggregateOffer","lowPrice":35.95,"highPrice":35.95,"priceCurrency":"USD","priceValidUntil":"2026-06-17","offerCount":1,"availability":"https://schema.org/InStock","url":"https://storestream.ai/products/rule-one-mass-gainer-2e7faa55","hasMerchantReturnPolicy":{"@type":"MerchantReturnPolicy","applicableCountry":"US","returnPolicyCategory":"https://schema.org/MerchantReturnFiniteReturnWindow","merchantReturnDays":30,"returnMethod":"https://schema.org/ReturnByMail","returnFees":"https://schema.org/FreeReturn"},"shippingDetails":{"@type":"OfferShippingDetails","shippingDestination":{"@type":"DefinedRegion","addressCountry":"US"},"shippingRate":{"@type":"MonetaryAmount","value":"0","currency":"USD"},"deliveryTime":{"@type":"ShippingDeliveryTime","handlingTime":{"@type":"QuantitativeValue","minValue":0,"maxValue":1,"unitCode":"DAY"},"transitTime":{"@type":"QuantitativeValue","minValue":1,"maxValue":7,"unitCode":"DAY"}}},"offers":[{"@type":"Offer","seller":{"@type":"Organization","name":"Tiger Fitness"},"price":35.95,"priceCurrency":"USD","priceValidUntil":"2026-06-17","availability":"https://schema.org/InStock","url":"https://tigerfitness.com/products/rule-one-mass-gainer-high-calorie-protein-powder","itemCondition":"https://schema.org/NewCondition","hasMerchantReturnPolicy":{"@type":"MerchantReturnPolicy","applicableCountry":"US","returnPolicyCategory":"https://schema.org/MerchantReturnFiniteReturnWindow","merchantReturnDays":30,"returnMethod":"https://schema.org/ReturnByMail","returnFees":"https://schema.org/FreeReturn"},"shippingDetails":{"@type":"OfferShippingDetails","shippingDestination":{"@type":"DefinedRegion","addressCountry":"US"},"shippingRate":{"@type":"MonetaryAmount","value":"0","currency":"USD"},"deliveryTime":{"@type":"ShippingDeliveryTime","handlingTime":{"@type":"QuantitativeValue","minValue":0,"maxValue":1,"unitCode":"DAY"},"transitTime":{"@type":"QuantitativeValue","minValue":1,"maxValue":7,"unitCode":"DAY"}}}}]},"model":[{"@type":"ProductModel","name":"16 Servings / Chocolate Fudge","sku":"1009191","size":"16 Servings","offers":{"@type":"Offer","price":54.95,"priceCurrency":"USD","availability":"https://schema.org/InStock"}}]}

Rule One Mass Gainer(16 Servings)

Where to Buy