10 Best Mass Stack Supplement of December 2025

• Vitamin C, Zinc and Vitamin D Provide Immune Support along with Vitamin E
• Packaging may vary - New look, with the same trusted Quality
• High Calorie Weight Gainer: 1,250 Calories per 2-Scoop Serving
• 50 Grams of Protein per Serving for fueling Intense Workouts
• Over 250 Grams of Carbohydrates per Serving
• 25 Vitamins and Minerals Plus Creatine and Glutamine
• Using an Electric Blender to Add Fresh or Frozen Fruits, Peanut Butter, Nuts and Other Calorie Dense Foods to Boost Your Weight Gain Potential
• Search "ON Apparel True Strength" to see our new ON clothing line

Optimum Nutrition

• Hydration Multiplier is a great-tasting, non-GMO electrolyte drink mix powered by CTT to deliver hydration to the bloodstream faster and more efficiently than water alone. With a sunny mix of citrus notes, Lemon Lime is equal parts zesty and refreshing.
• Cellular Transport Technology, or CTT, is the breakthrough delivery system, used in all of our products, designed to enhance rapid absorption of water and other key ingredients into the bloodstream.
• Non-GMO and made with premium ingredients, Hydration Multiplier Electrolyte Powder Drink Mix contains 5 essential vitamins including Vitamins B3, B5, B6, B12 and Vitamin C. It's also gluten-free, soy-free, and dairy-free.
• CONVENIENCE Single-serving, travel-friendly packets are easy to enjoy on the go. Pour one easy-to-open packet into 16 oz of water, mix or shake, and hydrate.
• With each purchase you make, we donate a serving to someone in need around the world. Liquid I.V. provides much-needed hydration in disaster zones, hospitals, impoverished communities, and emergency living quarters across the globe. Since 2015, we have donated over 19 million servings.

Liquid I.V.

• Alpha Brain Daily Mind Support: Boost your brain with Onnit Alpha Brain Booster. These mind supplements for focus can help enhance memory and cognitive speed.
• Enhance Your Focus: Whether you’re focusing on your career, academics, social life, or athletics, Alpha Brain helps support memory, mental speed and focus
• Carefully Selected Ingredients: These brain vitamins are formulated with high-quality nutrients. They include Cat’s Claw Extract, Bacopa, Oat Straw, Huperzia Serrata, and our Focus and Flow Blends.
• Quality Formulas: Alpha Brain is stimulant-free to avoid afternoon lull. It is free of caffeine, dairy, nuts, or gluten.
• Leading Nootropics Since 2011: Alpha Brain supplements have been a market leader in the nootropics space since 2011.

ONNIT

• High potency turmeric pills enhanced with bioperine: BioSchwartz turmeric formula has 1500mg of turmeric curcumin with 95% standardized curcuminoids per serving (high potency) and 10mg of bioperine (black pepper, curcumin with black pepper) aiding in enhanced absorption and bio-availability
• All natural, non-GMO, no fillers, binders or preservatives: Bioschwartz professional grade turmeric with bioperine (curcumin with bioperine) is a natural turmeric powder; turmeric powder has higher absorption compared to common turmeric teas, and this curcumin is also free of soy, gluten, milk, egg, wheat, GMOs, peanuts, sweeteners, shellfish and sugar
• Professionally formulated & made in the USA: Bioschwartz turmeric extract is formulated by professionals and manufactured in the USA following strict GMP guidelines; this turmeric with bioperine is 3rd-party tested to ensure the quality and purity of each batch
• Naturally potent ingredients: this turmeric curcumin supplement’s potency is enhanced with patented bioperine (10mg per serving), a type of black pepper extract shown to increase absorption and bioavailability in turmeric supplements
• Bioschwartz professional quality standards: every batch of Bioschwartz turmeric curcumin with bioperine is 3rd-party tested for purity and potency and each bottle is manufactured in the USA using imported and domestic ingredients; this turmeric supplement is formulated for women and men who want to enjoy the benefits of turmeric curcumin supplements

BioSchwartz

Page Street Publishing

• ACTIVATE REAL ANABOLISM FOR BIGGER, STRONGER, HARDER AND DENSER MUSCLES: A a powerful ANABOLIC ACTIVATOR. It is for those who want to build lean, dense, high-quality muscles with extra hardness.
• TRIGGER MUSCLE PROTEIN SYNTHESIS: When used in combination with intense weight training, and muscle building exercises and sports activities. The adaptogenic properties of ANABOL help signal your body to increase muscle protein synthesis. muscle-building, recovery and strength gains can occur at a faster pace. You should consume a high protein diet while taking ANABOL.
• VEGETARIAN FRIENDLY: Made with fast absorbing vegetable caps and free of animal products. This can safely be used with a vegetarian diet.
• ACHIEVE LEANER AND DENSER MUSCLE MASS: Perfect for bodybuilding, weight lifting, and athletes who need increased strength.
• REPAIR MUSCLE & RECOVER FASTER: Not only does it help build muscle, it makes your recovery time faster.

Nutrex Research

• Increase Endurance & Energy: Build XT is a powerful daily muscle builder supplement for men and women and quite literally the first muscle building & recovery supplement using this unique combination of science-backed bodybuilding ingredients. Build XT helps fuel lean muscle growth, strength increases, power output, and endurance in the gym with just two capsules per day pre workout.
• Muscle & Strength Builder: By supplementing with Build XT, you effectively give your body scientifically proven ingredients that enhance your strength, stamina, oxygen uptake, and blood flow. This means no more mediocre workouts, just peak performance and P.R’s.
• Clinically Studied Ingredients: Build XT is quite simply the best natural anabolic muscle builder on the market. This premium pre workout muscle builder contains PeakO2, ElevATP, and Astragin - three revolutionary clinically effective ingredients. The synergistic ingredient stack works to significantly improve muscle growth, strength, power, and endurance. Experience results you can actually feel from the very first dose.
• USA Manufactured in a cGMP Facility: Effective muscle building supplements seem to be a thing of the past. We formulated Build XT to be the best muscle-building supplement on the market by including only proven ingredients in clinical doses. Best of all, every Jacked Factory product is manufactured in the USA in a state-of-the-art cGMP facility.

Jacked Factory

• ▶ 2 NORATEENS: Heavyweight II & Extreme in a single powerful stack. Both available as individual products.
• ▶ BUILD HARD, LEAN MUSCLE with this powerful daily workout muscle builder stack for men and women
• ▶ STRENGTH & ENDURANCE Scientifically proven ingredients that enhance your muscular strength, stamina, oxygen uptake, and blood flow.
• ▶ SCIENTIFICALLY-DEVELOPED 7 strong and powerful bodybuilding agents make up the exclusive synergistic formulation. Intense muscle gain supplement weight gain pills. Hardcore muscle mass muscle gainer for men
• ▶ MANUFACTURED IN PHARMA GRADE FACILITIES. All LA Muscle supplements are manufactured in state-of-the-art facilities. We guarantee that you are getting the purest, safest and highest quality enhancer products on the market. No Side effects. Do not accept cheaper imitations.

LA Muscle

• MUSCLE BUILDER – MuscleTech Muscle Builder is a clinically backed muscle building formula that will help you boost strength and performance
• ENHANCED STRENGTH AND PERFORMANCE – Every serving delivers 400mg of PEAK ATP (adenosine 5’-triphosphate disodium) for enhanced strength, performance and muscle recovery
• THICKER MUSCLES – In a 12 week study, subjects gained 90% more lean muscle than the placebo group (8.8 lbs vs 4.6 lbs). In the same study, test subjects increased muscle thickness by 96% more than the increase for the placebo group
• AMAZING PUMPS – While supporting recovery, Muscle Builder has been shown to also support vasodilation and increased blood flow for incredible, shirt-splitting pumps
• DAILY WORKOUT SUPPLEMENTS – Take 1 capsule with a glass of water 30 to 45 minutes before your workout. On non-training days, take 1 serving on an empty stomach before breakfast

MuscleTech

• Boost Testosterone: Ingredients in Methyl Andro Hardcore help support free testosterone, allowing a free flow of extra energy and intensity to take your workout to the next level.
• Build Muscle Mass: Methyl Andro Hardcore’s Muscle Growth Blend offers a synergistic approach for building muscle mass. The ingredients in the Muscle Growth Blend help to activate growth factors for quicker recovery and growth development, and elevate natural testosterone levels. A key combination to fuel an intense workout and recovery.
• Increase Workout Vigor: Includes LaxoTest Complex, a high-powered blend of clinically studied ingredients, which has been shown to support strong increases in healthy testosterone levels, strength, vigor, vitality, antioxidant support, and protection from physical stress. Ingredients include: 1 g of D-Aspartic Acid, 200 mg of Smilax Officinalis Root Powder, and 200 mg of PrimaVie Purified Shilajit
• More Muscle Definition: Pro-Estro Suppress Blend supports the suppression of estrogen and prolactin. The suppression of estrogen and prolactin helps to maximize your body’s ability to utilize testosterone, resulting in leaner cuts and greater muscle definition.
• Use The Power of Fenupro: Methyl Andro Hardcore’s Andro Test Blend features FenuPRO, an anabolic activator that facilitates lean muscle and increases strength. FenuPRO offers 600 mg of Fenugreek Seed Extract, which yields a minimum of 50% Saponins, Furastanolic Saponins, and Protodioscin to help with increases in strength in the gym! Saponins have been shown to increase the levels of luteinizing hormone, which signals the body to increase testosterone levels naturally.

PMD