Most clinics know their cost per acquired client to the last złoty, yet cannot answer a simpler question: what did the product used in the last treatment actually cost? This is not an accounting detail. In injectable-led practices, variable costs, mostly product and single-use supplies, absorb 40 to 50 percent of revenue. If you are not measuring that line, you are not managing half of your income statement.
The problem grows with the market. Poland's aesthetic injectables segment was valued at 17.63 million USD in 2024, with a 2033 forecast of 40.53 million USD at a 9.69 percent compound annual growth rate. More treatment volume means more stock, and stock managed by eye scales losses just as efficiently as it scales revenue.
The loss that never appears on an invoice
Your distributor invoice shows how much product you bought. It does not show how much reached a patient. The gap has four sources, and every one of them is measurable.
Vial residue. A measurement published in the Journal of Clinical and Aesthetic Dermatology found that drawing toxin through the vial stopper with conventional technique leaves an average of 5.08 units out of 100, roughly five percent of the product. The author, working through 615 vials a year as a solo injector, calculated the annual loss at 15,621 USD. That is product you paid for, will not sell, and will not see in any report.
Expiry. In medical aesthetics, 8 to 10 percent of supply spend is written off to expiry. In dental practices, which buy with comparable discipline, the write-off runs 3 to 7 percent of annual supply value.
Rush orders. Running out today means an emergency delivery, and that costs 25 to 40 percent more than a planned order. You are paying a premium for your own lack of forecasting.
Carrying cost. Capital frozen in a cabinet is not free. The Institute for Supply Management puts the full cost of holding inventory at 20 to 25 percent of its value per year, roughly 2 percent a month.
Three numbers that describe your stockroom
You do not need hospital-grade software. You need three metrics calculated once a month.
1. Product cost per treatment. Do not divide the vial price by the units printed on the label. Divide it by the units actually charged out of that vial. The gap between those two numbers is your residue. If a vial costs 1,200 PLN and states 100 units but you bill 95, your real unit cost is 12.63 PLN, not 12.00 PLN.
2. Inventory turns. Annual cost of supplies used, divided by average inventory value. Average practices reach 4 to 6 turns a year, the best 8 to 12. Low turns are not safety. They are cash sitting on a shelf next to an approaching expiry date.
3. Write-off rate. Value of product written off this month, divided by value of product consumed. Above 5 percent, the problem is your purchasing plan, not your supplier.
What this is worth in money
Here is the arithmetic using the rates cited above, for a clinic spending 120,000 PLN a year on product and supplies, holding 25,000 PLN of average stock.
| Source of loss | Assumption | Annual amount |
|---|---|---|
| Vial residue | 5% of product value | 6,000 PLN |
| Expiry | 8% of supply spend | 9,600 PLN |
| Rush orders | 10% of volume at a 30% premium | 3,600 PLN |
| Carrying cost | 22% of average stock | 5,500 PLN |
| Total | 24,700 PLN |
That is about 20 percent of the entire materials budget. Systematic inventory control recovers 70 to 80 percent of it, meaning 17,300 to 19,800 PLN a year in this example. For context, a well-run treatment clinic operates at roughly 27 percent operating margin, so recovering that money is equivalent to about 65,000 PLN of revenue you never have to generate.
A reorder formula you can put in a spreadsheet
Instead of ordering when the shelf looks empty, set a reorder point for every item:
Reorder point = (average daily usage x lead time in days) + safety stock
where safety stock = average daily usage x lead time x 0.5.
In practice: if you use 2 vials a day and delivery takes 5 days, the reorder point is (2 x 5) + 5 = 15 vials. When stock hits 15, you order. Raise the 0.5 multiplier to 1.0 for products with irregular demand, and lower it to 0.25 for products your distributor always has available.
There is a second condition: the reorder point can never exceed what you will consume before the expiry date. If the formula says hold 15 vials, you use 2 a day and shelf life is 30 days, the ceiling is 60 vials and you are fine. For a product used once a week with a one-month shelf life, the ceiling is 4, and the ceiling wins.
A matrix: what to stock deep, what to stock thin
| Stable demand | Irregular demand | |
|---|---|---|
| Long shelf life | Stock deep, order rarely and in bulk | Stock medium, negotiate price on annual volume |
| Short shelf life | Stock thin, order often on a fixed cycle | Stock minimum, order against a confirmed booking |
The bottom-right cell is where most write-offs are born. Rarely used products with short shelf lives should be bought only after the patient is in the calendar, never held just in case.
FEFO, not FIFO, and the obligation people forget
A clinic does not run on first in, first out. It runs on first to expire, first out. A newer delivery can carry a shorter date than what is already on the shelf. Sort by expiry date, not delivery date, and label every batch with a visible date.
There is a regulatory layer on top. Dermal fillers fall under Annex XVI of MDR 2017/745, which requires storing the UDI of the implanted device and issuing the patient an implant card. Batch records stop being a housekeeping preference and become a compliance requirement. If you have to record the lot number at every treatment anyway, that same record can feed your stock ledger.
A 30-day rollout
- Days 1 to 3. Physical count. Every item, quantity, lot number, expiry date, purchase price. That is your baseline inventory value.
- Days 4 to 7. Calculate product cost per treatment for your five most expensive products. Compare label units against units actually charged in treatment records over the last quarter.
- Days 8 to 14. Set a reorder point for every item using the formula, then check it against the expiry ceiling.
- Days 15 to 21. Capture the lot number at every treatment, in the same place you record the appointment. One step, not two systems.
- Days 22 to 30. First monthly report: turns, write-off rate, and a list of batches expiring within 60 days.
From month two this report takes fifteen minutes, and the short-dated list becomes the basis for planning a promotion instead of a write-off.
FAQ
Do I need dedicated inventory software for two locations?
Not immediately. While the item count stays in the low dozens, a spreadsheet with a reorder point and an expiry date is enough. The break comes when product moves between locations, because records diverge within weeks and you then need a shared stock level tied to the treatment calendar.
How often should I run a physical count?
A full count quarterly, plus a monthly spot count of your ten most expensive items. Checking those items monthly catches most of the value discrepancies for very little effort.
Should vial residue be added to the treatment price?
It does not need a separate line. It needs to be inside the unit cost you price from. If you calculate margin on label units rather than charged units, your real margin is a few percent below what your spreadsheet shows.
What do I do with a batch expiring in a month?
Schedule it, do not panic-discount it. The short-dated batch list should reach whoever builds the calendar, so those units get assigned to specific appointments that are already booked. A write-off is a last resort, not the default end of a product's life.
Are low inventory turns safe?
No. Low turns mean cash sitting on a shelf, ageing alongside the product. Safety comes from a short, predictable lead time and a correctly set reorder point, not from a high stock level.
Closing thought
The stockroom is the one place in a clinic where you can improve the bottom line without raising prices and without acquiring a single new patient. It has one requirement: lot number, expiry date and consumption have to be recorded in the same place you record the treatment. Palyri's inventory module is wired into the treatment record precisely so that entry happens once and then feeds turns, write-off rate and the expiring-batch list on its own.
Sources
Want to implement this in your clinic?
Book a free Palyri demo. We'll show how it works on your clinic's data.
Book demo via WhatsAppPaulina Zielińska
Konsultant w branży beauty
Ponad 4 lata doświadczenia w branży beauty: najpierw od środka jako manager kliniki, teraz jako niezależny konsultant. Wdrożyła systemy automatyzacji sprzedaży i CRM w kilkudziesięciu klinikach estetycznych w Polsce.