What is FEFO and why do supplements use it?

FEFO stands for First Expired, First Out. Unlike FIFO (First In, First Out), FEFO prioritizes shipping the units closest to expiration first, regardless of when they arrived in the warehouse. Supplements use FEFO because products have defined expiration dates based on stability testing, and selling older stock first reduces the risk of expired product sitting in inventory. Industry data shows expired stock write-offs drop significantly when warehouses switch from FIFO to FEFO.

How long do supplements last before they expire?

Most dietary supplements have a shelf life of 18 to 36 months from the date of manufacture, depending on the dosage form and ingredients. Capsules and tablets typically last 24 to 36 months. Gummies are often shorter at 18 to 24 months. Liquids and probiotics may be 12 to 24 months. Shelf life is determined by stability testing conducted by the manufacturer, not estimated. Storage conditions significantly affect whether a product reaches its labeled expiration date.

How much expired supplement inventory is normal?

Industry estimates suggest 10 to 18 percent of supplement inventory is written off due to expiration. This is higher than most consumer product categories because of relatively short shelf lives and the challenge of forecasting demand for new brands. Implementing FEFO rotation, accurate demand forecasting, and proper storage conditions can reduce write-offs to under 5 percent. One distributor reported reducing monthly expired stock costs from $6,000 to under $1,000 after implementing FEFO.

Supplement Inventory Management: Shelf Life, Reorder Timing, and Storage

Supplements expire. That single fact makes inventory management different from most consumer products. Every unit you hold has a clock ticking. Wrong rotation, wrong storage, or wrong reorder timing turns saleable inventory into waste. Industry data suggests 10 to 18 percent of supplement inventory gets written off to expiration.

Dietary supplement manufacturers must comply with 21 CFR Part 111 (Current Good Manufacturing Practice for dietary supplements). This includes requirements for personnel, facilities, equipment, production, laboratory operations, and record-keeping.

FEFO vs FIFO: Why It Matters for Supplements

Most warehouses use FIFO (First In, First Out): the oldest inventory ships first. For supplements, FEFO (First Expired, First Out) is the better approach. FEFO ships the units closest to their expiration date first, regardless of when they entered the warehouse.

Why does this distinction matter? Consider two batches of the same product. Batch A arrived three months ago with 30 months of shelf life remaining. Batch B arrived last week but was manufactured earlier, with only 20 months remaining. Under FIFO, Batch A ships first. Under FEFO, Batch B ships first because it expires sooner.

One supplement distributor reported cutting monthly expired stock costs from $6,000 to under $1,000 after switching from FIFO to FEFO. The cost savings came entirely from reducing products that aged past sellable thresholds.

Shelf Life Tracking

Shelf life for dietary supplements is determined by stability testing, not estimates. Your manufacturer tests how the product holds up over time under defined storage conditions. The result determines the expiration date printed on your label.

Dosage Form	Typical Shelf Life	Storage Sensitivity
Capsules	24 - 36 months	Moderate (moisture)
Tablets	24 - 36 months	Low
Powders	18 - 30 months	High (moisture, clumping)
Gummies	18 - 24 months	High (heat, humidity)
Softgels	24 - 36 months	Moderate (heat)
Liquids	12 - 24 months	High (temperature, light)
Probiotics	12 - 24 months	Very high (refrigeration often required)

Most retailers and Amazon require at least 12 months of remaining shelf life at the time of receipt. Some require 18 months. Check each channel's requirements before shipping.

Reorder Point Calculation

Reorder too late and you stock out. Reorder too early and you tie up cash in inventory that sits in a warehouse. The reorder point balances these risks.

Reorder point = (Average weekly sales x Lead time in weeks) + Safety stock

Example: You sell 400 units per week. Your manufacturer's lead time is 10 weeks. Your safety stock is 3 weeks of sales (1,200 units).

Reorder point = (400 x 10) + 1,200 = 5,200 units

When your available inventory drops to 5,200 units, place the next order.

Safety stock should account for production delays, ingredient shortages, and seasonal demand spikes. Two to four weeks of additional coverage is typical for supplement brands.

Storage Requirements

Proper storage is not optional. It directly affects whether your products reach their labeled expiration date with full potency. The key factors:

Temperature: Most supplements should be stored between 59 and 77 degrees Fahrenheit (15 to 25 degrees Celsius). Probiotics and some specialty ingredients require refrigeration. Gummies and softgels degrade faster above 80 degrees.
Humidity: Relative humidity should stay below 60 percent. Capsules, powders, and effervescent products are especially sensitive to moisture. Humidity above 70 percent can cause clumping, discoloration, and accelerated degradation.
Light: Direct sunlight and even prolonged fluorescent exposure can degrade certain vitamins (particularly B vitamins and vitamin C). Store in opaque containers or dark areas.
Pest control: Stored product facilities need active pest management. Botanical ingredients and flavored products (especially gummies) attract insects. FDA inspectors check for evidence of pest activity.

Working with Your 3PL on Supplement Inventory

Not every warehouse or fulfillment provider understands supplement-specific inventory needs. When evaluating a 3PL for supplement storage and fulfillment, confirm these capabilities:

FEFO rotation capability in their warehouse management system
Climate-controlled storage with temperature and humidity monitoring
Lot-level tracking (ability to trace any shipped unit back to a specific production batch)
Expiration date visibility in their reporting dashboard
Experience with supplement brands (FDA-registered facility preferred)
Willingness to pull inventory reports showing remaining shelf life by lot

For detailed 3PL evaluation criteria, see our guide to vetting a 3PL for supplements.

Disclaimer: This guide is educational content, not professional advice. Storage requirements and shelf life ranges are general guidelines. Consult your manufacturer's stability data and your 3PL's storage specifications for product-specific requirements. See our Terms of Service for details.