The practical answer
Compare qualified magnesium ingredients by the cost of delivering the same elemental magnesium target, then account for manufacturing performance and purchasing constraints. Price per kilogram alone can reverse the apparent ranking. Keep ingredient consumption, process yield, safety stock and formula overage as separate calculations.
Define the common comparison before using a price
Use the same elemental magnesium contribution, finished format and approved performance requirements for every option. Record a landed price per kilogram, including the cost components your purchasing policy assigns to the ingredient. Use an agreed as-received magnesium fraction rather than mixing dry-basis assays with delivered kilograms.
The distinction between nutrient amount and source-ingredient weight also matters in labeling. FDA's supplement-labeling guide illustrates it with calcium: the declared mineral amount is not the weight of the entire source salt. The calculations below apply that mass distinction to magnesium purchasing, without determining a clinical intake or approving a label. [1]
Calculate an illustrative cost per thousand servings
Suppose a development brief assigns 100 mg of elemental magnesium per serving to one ingredient. Ingredient kilograms per 1,000 servings = 100 mg × 1,000 ÷ 1,000,000 ÷ magnesium fraction. Multiply that result by landed price per kilogram. The prices and assays below are invented for arithmetic, not MagneINNO quotations or grade specifications.
At these hypothetical prices, option A costs more per kilogram but slightly less per 1,000 servings. That conclusion holds only for this mass-and-price calculation. An option that fails taste, identity, contaminant or process requirements does not become acceptable because its calculated mineral cost is lower.
| Calculation | Example A | Example B |
|---|---|---|
| As-received magnesium fraction | 0.120 | 0.100 |
| Illustrative landed price | $12.00/kg | $10.50/kg |
| Ingredient per 1,000 servings | 0.83333 kg | 1.00000 kg |
| Ingredient cost per 1,000 servings | $10.00 | $10.50 |
| Cost per kg of elemental magnesium | $100.00 | $105.00 |
On smaller screens, scroll the table horizontally.
Turn the formulation into a purchase plan
For 100,000 saleable servings using example A, theoretical ingredient consumption is 83.333 kg. If a documented planning assumption is a 97% recovery of otherwise identical formula through filling and packaging, using the unrounded theoretical quantity, procurement demand is approximately 85.911 kg. This models uniform production loss; it does not authorize increasing magnesium concentration within each serving.
If that hypothetical material is purchased only in 25 kg packs, round 85.911 kg up to four packs, or 100 kg. The 14.089 kg balance is inventory, not an instruction to add the remainder to the batch. Evaluate whether it can be used before its relevant expiry or retest date and whether an open-pack handling limit applies.
- Separate pilot and analytical sample requirements from commercial consumption.
- Deduct usable, released inventory; do not count quarantined or allocated stock as available.
- Record safety stock as kilograms and a demand scenario, with its own approval.
- Keep freight, minimum order, pack size, lead time and currency date visible beside the quote.
- Ask manufacturing to confirm yield assumptions instead of borrowing a percentage from another product.
Compare the cost that survives the pilot
After trial production, add measured changes in line rate, reject quantity, testing, flavor system and packaging requirements. Use the same production boundary for every candidate. A hypothetical five-percent ingredient saving may be immaterial if a candidate changes the required serving format or causes a slower filling cycle.
Keep the workbook version tied to the quote, specification and formulation revision. Recalculate when assay basis, lot allocation, serving size or delivery conditions change. Use the elemental-magnesium calculator for the initial mass check, then retain this procurement calculation with the approved commercial assumptions.
Common questions
Should I use the minimum assay or the actual lot result?
Use the basis approved for the decision. Budgeting may use a contractual assumption, while batch input must follow the approved formulation and quality procedure. Label the assumption so the two calculations are not confused.
Is a procurement allowance the same as nutrient overage?
No. Extra purchased stock covers supply or production needs. Nutrient overage changes formula concentration and requires its own justification and approval.
Does the cheapest cost per elemental magnesium identify the best supplier?
No. Apply it after qualification, then include format performance, reliability and measured manufacturing costs. The arithmetic cannot establish equivalence between chemically or functionally different ingredients.