NOW® Double Strength HMB 1000 mg with Vitamin D-3: Advanced Lean Muscle Protection & Healthy Aging Support
NOW® Double Strength HMB delivers a full 1,000 mg of clinically studied Calcium β-Hydroxy β-Methylbutyrate combined with 500 IU of Vitamin D-3 in each convenient tablet. HMB is the active compound naturally produced in tiny amounts from the essential amino acid leucine that signals your body to defend, preserve, and rebuild lean muscle tissue. By helping to slow down everyday muscle protein breakdown and stimulating new muscle building, this high-potency formula supports physical strength, athletic recovery, and active vitality at any age.
Quick Specs Snapshot
✓Active Form & Potency: 1,000 mg of pure HMB (from Calcium β-Hydroxy β-Methylbutyrate Monohydrate) plus 12.5 mcg (500 IU) of Vitamin D-3 and 168 mg of bioavailable calcium per single tablet.
✓Primary Cellular Target: Activates the mTOR protein synthesis pathway while blunting the ubiquitin-proteasome system that breaks down muscle fibers.
✓Supply & Value Math: 90 double-strength tablets per bottle provide a full 45 to 90-day supply, cutting your daily pill count in half compared to standard 500 mg capsules.
✓Formulation Purity: Formulated with patented myHMB®, non-GMO, clean vegetarian coating, allergen-friendly, and packaged in an eco-friendly 100% post-consumer recycled (PCR) resin bottle.
Many discount brands sell unpatented, raw HMB powders that taste harsh and acidic, irritate the stomach lining, or fail to absorb evenly. NOW® utilizes pharmaceutical-grade Calcium HMB (patented myHMB®), which binds HMB to elemental calcium. This creates a stable, solid tablet that dissolves smoothly in your digestive system without stomach distress. When combined with active Vitamin D-3, clinical research shows that muscle cells become more responsive to HMB, delivering significantly better muscle retention than standalone HMB formulas.
Ideal For Shoppers Who:
✓Fitness Enthusiasts & Athletes: Individuals engaged in heavy resistance training, distance running, or high-intensity exercise who want to prevent muscle soreness and speed up repair between sessions.
✓Seniors & Active Agers: Men and women over 40 looking to preserve natural muscle mass, functional strength, physical mobility, and bone support as part of a healthy aging routine.
✓Caloric Deficit Dieters: Anyone reducing calorie or carbohydrate intake for weight management who wants to ensure their body burns fat rather than cannibalizing precious muscle tissue for energy.
Consider Another Option If:
✗Strict Calcium Restriction: You have been medically diagnosed with hypercalcemia or instructed by your physician to avoid supplemental calcium, as each tablet provides 168 mg (13% Daily Value) of calcium.
✗Bulk Powder Drink Mixers: You prefer scooping loose, unflavored powders into large workout jugs rather than swallowing a pre-measured coated tablet.
✗Under 18 Years of Age: This high-potency formula is calibrated specifically for adult metabolism and is not intended for children or adolescents.
Every purchase is backed by VitaNet®, LLC's unconditional 100% money-back guarantee—even on opened bottles, with return shipping covered—allowing you to evaluate your personal results completely risk-free.
How HMB and Vitamin D-3 Work Inside Your Muscles
To understand how HMB (β-Hydroxy β-Methylbutyrate) works, think of your muscle tissue like a brick wall. Every single day, your body naturally takes down damaged bricks (muscle breakdown) and replaces them with new ones (muscle protein synthesis). In a normal day, your body converts only about 5% of the dietary leucine you eat into HMB. To obtain 3,000 mg of HMB from food alone, you would have to consume over 60 grams of pure leucine or roughly 50 pounds of beef per day! NOW® Double Strength HMB provides this specialized compound directly to help tip your body's balance toward muscle preservation through four clear steps:
1. Shutting Off the Cellular Shredder (Ubiquitin-Proteasome System)
When you lift weights, run, or experience natural physical stress from aging, your body activates an internal "shredder" called the ubiquitin-proteasome pathway. This process attaches tiny chemical tags to muscle proteins, targeting them for destruction. HMB steps in and blunts the genes responsible for this shredder, shielding your muscle fibers from being dismantled for emergency fuel (Nissen et al., Journal of Applied Physiology, 1996).
2. Flipping On the Protein Building Switch (mTOR Signaling)
Beyond stopping muscle loss, HMB acts as a biological master switch. It directly stimulates a key protein complex inside your cells called mTOR (mammalian target of rapamycin). Turning on mTOR tells your muscle cells to start taking amino acids from your bloodstream and assembling them into brand-new, strong contractile proteins (Wilkinson et al., The Journal of Physiology, 2013).
3. Repairing the Muscle Cell Membrane Wall
Every muscle cell is surrounded by a protective outer membrane called the sarcolemma. Strenuous movement creates microscopic tears in this membrane wall. Muscle cells cannot easily take up cholesterol from your blood to patch these tears. HMB serves as a direct chemical precursor for local cholesterol synthesis right inside muscle tissue, supplying the exact building blocks needed to repair cell walls quickly and reduce post-exercise damage.
4. The Vitamin D-3 Multiplier Effect
Skeletal muscle fibers have specific docking stations called Vitamin D Receptors (VDR). Vitamin D is essential for regulating calcium (Ca2+) flow during muscular contraction. Clinical trials demonstrate that when Vitamin D levels are optimal, muscle tissue is significantly more responsive to HMB, leading to greater improvements in muscle strength and physical functionality than HMB taken by itself (Rathmacher et al., The American Journal of Clinical Nutrition, 2020).
Many discount brands and big-box store products cut corners by outsourcing their manufacturing to unknown third-party facilities that skip crucial analytical testing. This leaves consumers vulnerable to products contaminated with toxic heavy metals or diluted with cheap fillers. NOW® operates one of the most sophisticated in-house laboratory testing complexes in North America, accredited under strict ISO/IEC 17025:2017 standards. Their team of over 150 scientists conducts more than 19,000 analytical tests every month to enforce uncompromising quality:
✓ Inductively Coupled Plasma Mass Spectrometry (ICP-MS)
NOW tests every single batch of raw material and finished tablets using ICP-MS instrumentation. This technology detects heavy metals down to parts-per-billion (ppb) levels. Raw ingredients must meet strict standards that beat California Proposition 65 and United States Pharmacopeia (USP) safety limits for lead, arsenic, cadmium, and mercury.
✓ HPLC & UPLC Potency Verification
Using High-Performance Liquid Chromatography (HPLC) and Ultra-Performance Liquid Chromatography (UPLC), NOW chemists verify the exact molecular structure of the Calcium HMB compound. This guarantees that every tablet provides 100% of the stated 1,000 mg potency through the final day of its shelf life, with zero inactive adulterants.
✓ 500+ Chemical & Pesticide Screening
Using Tandem Mass Spectrometry (LC-MS/MS and GC-MS/MS), raw ingredients are thoroughly screened for over 500 agricultural residues, environmental pesticides, and synthetic chemical solvents to guarantee total cleanliness.
Every production run is quarantined until advanced microbiological culture testing proves zero presence of dangerous pathogens, including Salmonella spp., Escherichia coli, and Staphylococcus aureus. NOW's manufacturing facilities maintain an "A-rated" Good Manufacturing Practice (cGMP) registration from the Natural Products Association (NPA) and are certified by UL Solutions.
Daily Dosing, Timing & Smart Supplement Synergies
Getting the maximum benefit from HMB requires consistent daily intake. Following these simple dosing guidelines ensures optimal cellular uptake and tissue saturation:
Optimal Timing & Meals
Calcium HMB dissolves easily and can be taken with or without food. However, taking your tablet with a meal or protein shake that contains a small amount of dietary fat (such as eggs, yogurt, or healthy oils) enhances the natural absorption of fat-soluble Vitamin D-3.
Daily Dosing Strategy
As a dietary supplement for adults, take 1 tablet 2 to 3 times daily. The established clinical target for active athletes and muscle support is 3,000 mg per day (3 tablets). Taking 1 tablet with breakfast, 1 with lunch (or 30 to 60 minutes before training), and 1 with dinner maintains continuous circulating levels.
Smart Combinations & Spacing
HMB pairs synergistically with Creatine Monohydrate (which restores cellular ATP energy) and Whey Protein. If you take thyroid medication (like levothyroxine) or therapeutic iron supplements, space this product by at least 2 to 4 hours, as calcium binds to these compounds.
Timeline of What to Expect
Week 1 (Cellular Uptake): HMB begins saturating muscle tissue. If exercising intensely, you will likely notice faster recovery and less severe delayed muscle soreness (DOMS) within 24 to 48 hours following strenuous workouts.
Weeks 3–4 (Tissue Saturation): Muscle fibers reach optimal saturation. Daily strength training sessions feel more productive, exercise capacity improves, and muscles feel fuller and less fatigued during repetitive movements.
Months 2–3+ (Long-Term Preservation): Cumulative benefits are fully realized. Active agers experience dependable protection against lean tissue loss, better physical stamina during daily tasks, and sustained functional independence.
Knowing what to expect before you open the bottle builds confidence in your routine. Here is an honest, firsthand breakdown of the tablet format and every ingredient used:
Delivery Format & Swallowability
Standard HMB products are packed into bulky 500 mg gelatin capsules, forcing you to swallow 6 large pills every day. NOW® utilizes advanced compression technology to deliver a double-strength 1,000 mg dose in a single oblong tablet. The tablet is finished with a smooth vegetarian plant coating that becomes slick upon contact with water, allowing it to glide easily down your throat.
Natural Aroma, Taste & Color
Raw HMB powder has an unpleasant, sharp chemical taste. Because these tablets are completely sealed in a vegetarian coating, they are practically tasteless and odorless when swallowed with water. Natural color variation from crisp white to off-white is normal between batches and is a reflection of unbleached raw materials.
Other Ingredients Translated into Plain English
Hydroxypropyl Cellulose: A gentle, plant-derived dietary fiber used as a binder to hold the tablet firmly together so it will not crumble in the bottle.
Stearic Acid (vegetable source): A natural plant fatty acid that acts as a clean lubricant to ensure tablets press evenly without sticking to machinery.
Silicon Dioxide: A natural mineral compound (purified silica) that absorbs ambient moisture and prevents powders from clumping before tablet formation.
Vegetarian Coating: A plant-based clear coating composed of hypromellose (wood pulp cellulose), stearic acid, non-GMO sunflower lecithin, triethyl citrate, and sunflower oil that makes the tablet easy to swallow and protects active nutrients from humidity.
Storage & Bottle Specifications
Keep bottle tightly closed and store in a cool, dry, dark place after opening. This bottle is proudly made from 100% post-consumer recycled (PCR) resin, helping protect our environment while effectively blocking light degradation.
Supplement Facts & Retailer Verification
We provide complete label transparency. Verified against official NOW® Foods manufacturing specifications (Product Item #N2058 / NOW 2058):
Allergen Statement: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Patent Notice: **myHMB® is a registered trademark of TSI Group Co., Ltd. U.S. Patent # 8,815,280, # 9,259,430, # 9,539,224, and # 9,707,241.
Safety Caution: For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Keep out of reach of children.
Curator's Quality Note: Why Buy from VitaNet®, LLC?
Founded in 1995, VitaNet®, LLC is an independent, family-owned supplement retailer based at 887 Edison Street Northwest, Hartville, Ohio 44632. Bringing over 31 years of dedicated hands-on experience in human biochemistry and nutrition, we maintain strict quality standards that mass online marketplaces cannot match:
✓Direct Manufacturer Sourcing: Every bottle is obtained directly through authorized NOW® channels, ensuring 100% genuine inventory.
✓Climate-Controlled Facilities: All stock is housed in temperature- and humidity-monitored facilities to ensure that active compounds and Vitamin D-3 retain full biological potency.
✓BBB A+ Accreditation & Real Support: We have maintained an A+ Better Business Bureau rating for decades, providing real telephone assistance (330-877-8786).
✓Unconditional 100% Money-Back Guarantee: If you are not completely satisfied, we refund 100% of your purchase price and pay the return shipping costs, even on opened bottles.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Frequently Asked Questions
What is the difference between regular strength HMB and this Double Strength 1000 mg tablet?
Standard HMB supplements provide 500 mg per capsule, requiring you to take up to 6 large capsules per day to achieve clinically effective intake. NOW® Double Strength HMB packs a full 1,000 mg into each coated tablet, cutting the number of pills you need to swallow in half while delivering the same patented myHMB® raw material plus added Vitamin D-3.
Can I break or crush this tablet if I have difficulty swallowing pills?
Yes. You can use a standard pill cutter to split the tablet in half or crush it into a fine powder to stir into applesauce, yogurt, or a protein shake. Keep in mind that Calcium HMB has a slightly chalky mineral taste once the outer vegetarian film is cracked, but crushing does not degrade the active ingredients.
Why is Vitamin D-3 included in this HMB formula?
Scientific studies show that Vitamin D plays a crucial role in muscle health by activating Vitamin D receptors located directly on skeletal muscle tissue. When adequate Vitamin D is present, muscle cells absorb and respond to HMB far more efficiently, resulting in significantly greater muscle strength and functional physical performance than taking HMB alone.
Will taking NOW Double Strength HMB break an intermittent fast?
No. Calcium HMB is an amino acid metabolite containing virtually zero carbohydrates, sugars, or fats, and it does not trigger an insulin surge. Many athletes take HMB specifically during morning fasted cardio or lifting sessions to protect muscle tissue from breakdown while remaining in a fasted state.
Can I take this HMB tablet together with Creatine and Whey Protein?
Yes. In fact, combining HMB with Creatine Monohydrate and Whey Protein is one of the most effective combinations in sports nutrition. Creatine supplies immediate cellular ATP energy for muscular power, whey protein provides complete amino acids for muscle building, and HMB prevents muscle breakdown while accelerating post-workout recovery.
