Par levels are a margin decision, not a shelf count
A par level is the target amount of product a practice wants available before normal ordering resumes. A reorder point is the inventory level that triggers the next order. Both should be based on actual consumption, supplier lead time, service demand, and expiration risk.
Many medspas set par levels by feel: two boxes of neurotoxin, three filler syringes, one backup biostimulator kit. That may keep the cabinet stocked, but it does not tell the owner whether cash is sitting in slow-moving product, whether fast-moving services are at stockout risk, or whether ordering is protecting margin.
Start with usage velocity by product and service
The first input is real usage velocity: how much product is consumed per week or month. For injectables, that should be recorded in the same unit the provider uses during treatment, such as units, syringes, vials, mL, or treatment kits.
Usage velocity should be tied to service mix. A filler used in premium facial balancing may move slowly but carry high margin. A neurotoxin lot may move quickly but have tight reorder windows. Retail and consumables may support service delivery even if they are not billed directly. Each product deserves a reorder rule that reflects its business role.
Add supplier lead time and safety stock
A basic reorder point is average daily usage multiplied by supplier lead time, plus safety stock. If a product is used at 20 units per day, takes five days to arrive, and needs 40 units of safety stock, the reorder point is 140 units.
Safety stock is not a random cushion. It should reflect volatility: appointment spikes, supplier delays, training days, marketing campaigns, provider preferences, and the cost of a stockout. High-margin treatments with limited substitution options deserve more protection than slow-moving products that can be reordered quickly.
Do not let par levels ignore expiration risk
A high par level can look responsible until it creates expired product. Injectable, GLP-1, peptide, and IV therapy inventory should be reviewed with FEFO discipline so the first-expired lot is used first and reorder quantities do not bury soon-expiring stock.
The right question is not only whether the practice has enough product. It is whether the practice has enough usable product, from the right lots, with enough time to convert that inventory into profitable visits before expiration.
Separate reorder quantity from reorder timing
The reorder point tells the team when to order. The reorder quantity tells the team how much to buy. A practice can have a well-timed reorder and still create margin risk by buying too much of a slow-moving product or too little of a high-demand service input.
Reorder quantity should consider upcoming demand, package redemptions, provider schedule, vendor minimums, price breaks, cash position, expiration dating, and current open stock. The goal is not the largest discount. The goal is the most profitable inventory position.
Review par levels on a real operating cadence
Par levels should not be set once and forgotten. Review high-value products weekly for stockout, expiration, waste, and provider usage changes. Review full product categories monthly against service revenue, treatment COGS, inventory turns, and gross margin.
When Otzaro records product usage at the point of service, reorder planning becomes grounded in operational data. Owners can see actual usage by product, lot, provider, and service instead of relying on a visual cabinet check or a spreadsheet that trails reality.
A practical medspa reorder rule should include
Average usage velocity by product, unit of measure, provider, and service line.
Supplier lead time plus safety stock based on demand volatility and stockout cost.
Expiration and FEFO review so par levels do not create future waste.
Reorder quantity logic that balances cash, vendor minimums, service demand, and margin.
FAQ
What is a good par level for Botox or filler inventory?
There is no universal par level. The right level depends on weekly usage, appointment demand, supplier lead time, safety stock, expiration dating, and how costly a stockout would be for that service line.
How often should medspas update reorder points?
High-value or fast-moving products should be reviewed weekly. Full category reorder points should be reviewed monthly, especially when service mix, provider schedules, vendor lead times, or pricing changes.
Can a spreadsheet manage medspa par levels?
A spreadsheet can hold target numbers, but it usually falls behind when usage needs to connect to visits, lots, expiration dates, provider behavior, waste, and service margin. Reorder rules are stronger when they use live usage data.