Bulk Supplement 99% Calcium HMB Hydroxymethylbutyrate CAS 135236-72-5

Information:

HMB-Ca (calcium β-hydroxy-β-methylbutyrate) is a natural metabolite of the essential amino acid leucine. The body produces only small amounts on its own. Although tiny quantities exist in foods such as grapefruit, alfalfa, and catfish, daily dietary intake typically provides only 0.2–0.4 g – far below the levels used in clinical research.

Unlike many ingredients that focus on boosting muscle synthesis, HMB-Ca works primarily by slowing down muscle protein breakdown. This anti-catabolic effect becomes especially valuable during aging, periods of reduced activity, or physical stress.

More than 100 randomized controlled trials have examined HMB-Ca. A 12‑month study in older adults showed that HMB-Ca combined with vitamin D₃ helped maintain muscle strength and physical function – even without regular resistance exercise. The compound holds FDA GRAS status and has a well‑documented safety record at 3 g per day.

Specification:

Application:

1. Aging & Sarcopenia Risk

– After age 40, adults lose about 8% of lean body mass per decade; this accelerates to roughly 15% per decade after age 70. Gradual loss of muscle strength and function can affect mobility, balance, and daily independence.

– In a 12‑month randomized trial (Rathmacher et al., 2020), healthy older adults with insufficient vitamin D levels who took HMB-Ca plus vitamin D₃ (3 g/day HMB + 2000 IU vitamin D₃) showed improved composite functional scores – including sit‑to‑stand, walking speed, and grip strength – compared with placebo. 

Notably, this benefit was observed in participants not engaged in a resistance‑training program, while those who exercised did not gain extra advantage from the supplement.

– HMB-Ca can be considered for products targeting older individuals who have difficulty following regular strength training, such as those with limited mobility or low exercise adherence.

2. Short‑Term Immobilization or Bed Rest

– Even a short period of reduced activity (e.g., post‑surgery recovery, fracture, or illness) can cause measurable muscle loss. Studies on bed rest of 10–28 days consistently show declines in leg muscle mass and strength.

– Several clinical investigations have examined HMB supplementation during immobilization. The anti‑catabolic effect – reducing the activity of the ubiquitin‑proteasome pathway – helps preserve existing muscle tissue when physical activity is unavoidably low.

– Nutritional formulas for hospitalized or home‑recovering patients may include HMB-Ca as part of a broader protocol that also provides adequate protein and calorie support.

3. Calorie‑Restricted Periods for Active Individuals

– Athletes or physically active people sometimes go through phases of controlled calorie reduction to lose body fat while maintaining as much lean mass as possible. During such periods, the body’s protein breakdown rate can increase.

– Evidence suggests that HMB-Ca helps limit the increase in muscle breakdown markers during energy deficit. It does not directly burn fat or boost metabolism; rather, it supports muscle preservation so that weight loss comes predominantly from fat stores.

– Sports nutrition products designed for "cutting" phases, weight‑class athletes, or people on medically supervised low‑calorie diets may benefit from adding HMB-Ca.

4. Rehabilitation & Recovery from Physical Stress

– High‑intensity or unfamiliar exercise often causes temporary muscle damage, reflected by elevated creatine kinase levels and delayed‑onset muscle soreness (DOMS). Recovery time can influence training consistency.

– Several studies report that HMB-Ca intake reduces post‑exercise muscle damage markers and perceived soreness, especially in untrained or novice individuals. The effect is more modest in well‑trained athletes.

– Post‑workout recovery drinks or bars formulated with HMB-Ca may appeal to recreational exercisers and those returning to training after a break.

Q&A:

Q1: What is the usual daily amount of HMB-Ca used in studies?
A: Most clinical trials use 3 grams per day, often split into three 1 g doses taken with meals. Doses above 3 g have not shown extra benefit, and amounts below 2 g are less well studied.

Q2: Does HMB-Ca work without exercise?
A: Partially. For older adults not engaged in resistance training, the combination of HMB-Ca and adequate vitamin D improved muscle strength and function over 12 months. (The study used HMB-Ca plus vitamin D₃; the effect of HMB-Ca alone without vitamin D is less clear.) However, for strength athletes who already train hard and eat enough protein, the added effect is small.

Q3: Is HMB-Ca safe for long‑term use?
A: Yes. Trials lasting up to one year at 3 g/day report no significant adverse effects on liver, kidney, or blood markers. Minor gastrointestinal discomfort may occur occasionally, usually when starting supplementation.

Q4: Can HMB-Ca be taken together with protein powder or creatine?
A: Yes. No negative interactions have been reported. Whey protein provides the leucine and total amino acid substrate that complements HMB-Ca's anti‑catabolic action; creatine works through a different pathway (energy buffering).

Q5: How does HMB-Ca differ from leucine or BCAAs?
A: Leucine strongly activates muscle protein synthesis, whereas HMB-Ca primarily reduces muscle breakdown. 

In practical terms, leucine is more anabolic, HMB-Ca more anti‑catabolic. 

For healthy, exercising individuals with adequate protein intake, leucine may be more directly effective; for catabolic situations (aging, bed rest, calorie deficit), HMB-Ca offers a distinct advantage.

Q6: Does HMB-Ca help with weight loss?

A: No direct evidence supports fat loss from HMB-Ca. It can help preserve lean mass during a calorie‑restricted period, which indirectly improves body composition – but it is not a weight‑loss ingredient.

Q7: Are there any people who should avoid HMB-Ca?
A: Individuals with chronic kidney disease or those at risk of hypercalcemia should consult a physician before use, because the calcium content (roughly 200 mg per 3 g HMB-Ca) adds to total calcium intake. Safety during pregnancy or breastfeeding has not been established.