Comparison
HMB 500 mg and Double Strength HMB 1000 mg
HMB 500 mg (NOW Sports) lists 3 distinct ingredients and Double Strength HMB 1000 mg (NOW Sports) 3 (rows of one ingredient counted once); 3 are on both labels. On the site's similarity measure, which compares ingredient lists (1 for the same list, rarer ingredients counting for more; amounts are not part of it), the two formulas score 1.00: the same ingredients, at the amounts in the table below.
| Ingredient | HMB 500 mg | Double Strength HMB 1000 mg |
|---|---|---|
| Calcium | 160 mg (12%) | 170 mg (13%) |
| Vitamin D | 12.5 mcg (63%) | 12.5 mcg (63%) |
| HMB Hydroxymethylbutyrate | 1 g | 1 g |
Amounts are per serving as DSLD gives them: HMB 500 mg, 2 veg capsules; Double Strength HMB 1000 mg, 1 tablet. Current labels entered October 2024 and September 2025. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.
Each product on its own
- HMB 500 mgNOW Sports: every row against all products listing it
- Double Strength HMB 1000 mgNOW Sports: every row against all products listing it