Med spas deal with a more complex inventory situation than typical retail or service businesses. You’re tracking injectables measured by the unit, skincare products with expiration dates, consumables used during treatments, and retail products for sale. Each category needs its own tracking approach.

Injectables like Botox and fillers require unit-level tracking. When you purchase a vial, log the lot number, expiration date, and total units. As treatments happen, record how many units went to each client. This creates accountability, helps with ordering, and produces documentation if you ever face questions about product handling.

Separate treatment supplies from retail inventory in your system. The $200 serum you use during facials hits cost of goods sold when you use it on a client. The same serum sitting on your retail shelf hits cost of goods sold when someone buys it. These are different transactions even though it’s the same product. Your inventory system needs to distinguish between the two or your margins will look wrong.

Track service consumption when treatments use variable amounts of product. A filler appointment might use one syringe or three depending on the treatment plan. If your system just logs “filler treatment” without recording how much product was used, you can’t calculate your true cost per service or spot when usage seems higher than it should be.

Prepaid packages and memberships add another layer. When a client buys six laser sessions, you haven’t earned that revenue yet. You’ve created a liability. As they use each session, you recognize the revenue and the associated product costs. Med spa practice management software usually handles this, but you need to make sure your accounting system reflects the same timing.

Physical counts should happen monthly for high-value items like injectables and quarterly for everything else. Compare what’s on the shelf to what your system says should be there. Discrepancies happen from waste, breakage, theft, or just recording errors. Catching them quickly keeps your inventory records useful.

Most med spas use specialized software that handles scheduling, service documentation, and inventory together. Platforms like AestheticsPro, Vagaro, or Zenoti can track units used per treatment and adjust inventory automatically. The key is making sure that data flows into your accounting software correctly so your full-service bookkeeping reflects accurate cost of goods sold.

When inventory tracking works, you know your real margins on each service type. You can see which treatments are profitable and which are barely breaking even once you account for product costs. You can identify when waste is creeping up or when ordering patterns don’t match usage. Health and wellness businesses that skip proper tracking often think they’re profitable until they realize their inventory costs are eating their margins.

Working with Macomb County bookkeepers who understand the service-plus-retail model can help you set up systems that capture both sides accurately. The inventory tracking happens in your practice management software, but it needs to connect to your books in a way that shows the real financial picture.