Med spa expiry tracking: which vial, from which batch, and until when

There is a question that gets asked in a med spa and almost nowhere else in beauty. Somebody wants to know which unit was used on a particular client, on a particular day.

The question is which one, and it is an uncomfortable moment when the only honest answer is a binder with three different handwritings in it.

A count is a number. It tells you there are four vials in the fridge, and getting that number right is covered in how to do inventory in a salon. A count has never told you where they came from or how long they have left, and for most of a beauty business that gap costs nothing. Six liters of shampoo are interchangeable. Every unit of injectable stock carries a batch number and a date of its own.

What follows is the practice behind med spa expiry tracking: what a lot number is for, why the shelf rule most people learned does not fit dated stock, and what a workable routine looks like in a clinic with three treatment rooms. It describes how this is done in practice. What any regulation requires of you is a conversation for your own board and your own counsel. And so you know before reading on: per-unit expiry and lot tracking in Suplery is coming soon, and I say so again where it matters below.

🧊 The three questions a count cannot answer

Which unit. Four vials in the fridge are four identical objects until something makes them distinguishable.

From which batch. If a manufacturer identifies a production run, you need to know whether you hold any of it, and a quantity does not tell you.

How long it has left. A count taken in June says four. It does not say that two of them stop being usable in August.

For a hair salon those distinctions are academic, which is one of the ways inventory control differs across salons, spas and barbershops. In a room where a single unit of stock is worth a meaningful share of a day's takings, they are the difference between stock and a write-off you did not see coming.

All three answers start with one small number printed on the box.

🏷️ Lot numbers and lot tracking, plainly

A lot number identifies a production batch: everything made in the same run, under the same conditions, shares one. It exists so that if something is found to be wrong with a batch, that batch can be identified and pulled without pulling everything the manufacturer ever made.

It is printed on the packaging, usually small, usually near the expiry date. In most beauty businesses nobody has ever written one down, and in a med spa I would change that habit first.

Lot tracking is simply the practice of recording it: which lot, on which client, on which day, so the answer exists before anyone asks for it.

The date next to it matters just as much, and the rule most people use for dates is the wrong one.

📅 Why the shelf rule you learned is the wrong one

First in, first out is the rule everyone knows. Oldest stock at the front, take from the front, newest goes behind. It works well for almost everything in a salon.

For anything with a date on it, it is the wrong rule.

The rule that fits dated stock is first expired, first out, or FEFO. You use the unit that expires soonest, whether or not it arrived first. Those two are frequently different units, because a delivery can turn up with shorter dating than the stock already in your fridge.

This is established practice in health supply chains. The USAID | DELIVER PROJECT's Logistics Handbook puts it plainly: it is essential that the goods first to expire are also the first issued, regardless of when they arrived at the storage facility. The handbook is fair to FIFO as well, calling shipping by receipt date a common practice that works well in most cases. Dated stock is the case where it does not.

Here is what that looks like in a fridge with three vials:

• Vial A: received in March, expires February next year. FIFO uses it first; FEFO second.
• Vial B: received in March, expires February next year. FIFO uses it second; FEFO third.
• Vial C: received in June, expires in October. FIFO uses it third; FEFO first.

Whether that costs you anything depends on how fast you move. If two vials go in the seven months between March and October, FIFO reaches vial C in time and nothing is lost. If they do not, which is the ordinary situation for a product you use occasionally, FIFO has you working through the March stock while the June delivery expires behind it. FEFO removes the question, and it costs nothing to follow.

💡 The arrangement is the reminder. The CDC's vaccine storage and handling toolkit puts it in physical terms for clinics: arrange stock, for each product type, so that doses with the earliest expiration dates are placed in front of those with later dates. The box at the front will not always be the oldest box, and that is exactly what arranging by date is for.

A rule only helps if somebody follows it on a Tuesday with a full book. So here is the routine.

🗓️ A routine a busy clinic can hold

Four steps. The first one carries the other three.

At receiving, before anything is put away. Record the product, the lot number and the expiry date while the outer carton is still in your hands. Once it is unpacked and the box is gone, that information becomes hard to recover and sometimes impossible. Everything downstream depends on a couple of minutes at the door. In Suplery, scanning the carton's barcode on your phone brings the product and the quantity in straight away, so the only thing left to write down by hand is the lot and the date.

In storage, arranged by date. Nearest expiry to the front, every time a delivery lands. This is the step where FEFO either happens or does not.

At use, one line. Which unit, on whom, when. The hard part is that it has to be written by somebody in the middle of a treatment, which is exactly when nobody wants to be writing anything. My advice is to make it one line, in one place, and never two.

Once a month, a short review. Look at what is closest to expiry and decide: schedule it into treatments, or accept the write-off and look at the buying decision that created it. What leaves the shelf unused the rest of the month is covered in beauty salon back bar waste.

⚠️ Decide whose job receiving is, by name. A two-minute task shared between everyone is a two-minute task that stops happening. One person, named, with a deputy for their days off.

That routine holds in one room. It starts to strain the day a second room opens.

🚪 Three rooms and three providers

One room and one provider is manageable in your head. It stops being manageable the moment stock physically moves.

A vial in room two on Tuesday is in room one on Thursday. If the record does not move with it, the record and the fridge start telling different stories, and the person who finds out is whoever needs an answer fastest.

This is where the working method has to change. What works is a record kept in one place and updated by whoever moved the stock, at the moment they moved it. A Friday reconstruction by whoever happens to be free does not hold up. In Suplery that record is shared: every provider enters what they counted or received into the same stock from their own phone, and nobody has to reconcile three versions at the end of the week. How this plays out across a whole clinic is part of what our med spa page covers.

📒 The binder, and where it stops

Paper works. A binder by the fridge with a line per unit is a real system, it costs nothing, and plenty of good clinics run on one. There is real relief in having it, compared with having nothing.

Name what it costs, though. It holds four steps happening in one place, in one person's handwriting. It does not hold four steps happening in three rooms at once, with three people writing in it, one of whom is at the front desk and one of whom is gloved. It cannot be searched. And it cannot tell you what is closest to expiry without somebody reading every page.

That last one matters more than it sounds. The value of this practice shows up on the ordinary days, when knowing what is about to age out changes what you order this month. Traceability is the by-product; the return is a purchasing decision, which is the wider subject of our guide to salon inventory management.

Which brings up the honest part: what software can and cannot do here today.

📊 Doing it in software, honestly

The American Med Spa Association counted 10,488 US medical spas in 2023, up from 8,899 in 2022, in the summary of its 2024 State of the Industry report. That is a lot of clinics working out this routine for themselves.

Where salon inventory management software helps first is the ordinary part: what you hold, what left the shelf, what needs reordering, in one record that several people can update from wherever they are standing. In Suplery that part is live: counts from any phone on the team, and after a couple of counts, a draft order per supplier built from how fast each product goes, waiting for your approval.

On per-unit expiry and lot tracking specifically, I will be straight with you. In Suplery it is coming soon 🔜, and we are building it together with a small group of med spas. On a subject this close to compliance, saying anything else would be the wrong move. If you want a say in how it works, tell us and we will bring you in.

🧡 The ordinary half, working today

Counts, usage and reordering are live in Suplery now, and that is the half of this work that takes time out of your week. Per-unit expiry and lot tracking is coming soon.

👉 Start on Suplery

What is the difference between FIFO and FEFO?

FIFO uses whatever arrived first; FEFO uses whatever expires first. For dated stock they are frequently different units, because a new delivery can carry shorter dating than what is already in your fridge.

Isn't the expiry date on the box already?

Yes, until the box is gone. And reading it means walking to the fridge — a record lets you know what is close to expiry at the moment you are deciding what to order, which is when the knowledge is worth something.

We only carry three or four products. Do we need this?

Probably, because the number of product lines is not what makes it hard. The number of individually dated units is. Four product lines can easily be forty units with forty different dates.

Where is the lot number on the packaging?

Usually printed small on the outer carton and on the unit itself, near the expiry date, sometimes labeled LOT or with a batch symbol. Record it at receiving, while the carton is still in your hands.

Does this apply to medical-grade skincare too?

Same mechanic, lower stakes. Once opened, many skincare products also carry a period-after-opening mark (the small open-jar symbol), and that clock can run out well before the date on the box.

Does Suplery do med spa expiry tracking?

Not yet. Counts and reordering are live. Per-unit expiry and lot tracking is coming soon, built together with a small group of med spas.

How often should we review what is expiring?

Once a month suits most clinics. Tie it to the week you place your main order, so what you find in the fridge shapes the order while it can still matter.