Does HCG need to be refrigerated? Storage before and after mixing

HCG often needs refrigeration after mixing, but the exact instructions depend on the product. The U.S. labels for mixed Pregnyl and Novarel specify refrigeration at 36°F to 46°F (2°C to 8°C). Unmixed powder can have different storage requirements.

Start with the name and storage instructions on your own vial or carton. A shelf life quoted for another brand does not establish how long your medication can be kept.

By USAHCG · Updated November 2, 2026. Educational information; follow your prescription label and dispensing pharmacist's instructions.

HCG storage before and after mixing

Reconstitution means adding the specified diluent to a powder medication. These examples show why the product and preparation matter. They describe U.S. labeling, not every HCG formulation or a particular product sold by USAHCG. On small screens, scroll the table sideways to read all columns.

Product	Before mixing or use	After mixing or dispensing
Pregnyl, U.S. 10,000-unit vial	Unopened vial: 59°F to 77°F (15°C to 25°C), per the manufacturer's March 2025 label.	After reconstitution: refrigerate at 36°F to 46°F (2°C to 8°C) if not used immediately; discard after 60 days. Do not freeze or shake.
Novarel	Dry product: 68°F to 77°F (20°C to 25°C); the label permits excursions from 59°F to 86°F (15°C to 30°C).	After reconstitution with the specified bacteriostatic water: refrigerate at 36°F to 46°F (2°C to 8°C) and use within 30 days.
Ovidrel prefilled syringe	Already a liquid; no powder mixing is required. Refrigerate at 36°F to 46°F (2°C to 8°C) before dispensing.	Patients may keep it refrigerated until the labeled expiration date, or at up to 77°F (25°C) for no more than 30 days and use it within that period. Keep in its original package, protected from light. Discard unused material.

Sources: Pregnyl prescribing information, Novarel labeling, and Ovidrel labeling.

How long does HCG last in the fridge?

There is no single refrigerated shelf life for all HCG. In the examples above, mixed Pregnyl has a 60-day limit and mixed Novarel has a 30-day limit. Those periods depend on following each product's preparation and storage instructions.

Use the discard date supplied with your medication. If the pharmacy mixed it, ask when it was prepared and which date applies. For a compounded preparation or another brand, ask the dispensing pharmacist for its specific storage conditions and beyond-use date. Do not carry over the dates in this comparison.

I left my HCG out overnight. Can I still use it?

Ask your dispensing pharmacist or the manufacturer before using a vial that was stored outside its labeled conditions. The Pregnyl and Novarel instructions above do not establish a safe overnight room-temperature allowance for a mixed vial.

Have the product name, whether it was mixed, the time it was left out, and the approximate temperature ready. Mention any exposure to a hot car or freezing temperatures. If a dose is due, contact your prescriber for instructions rather than changing the dose yourself.

Ovidrel's labeled room-temperature option is specific to that prefilled syringe. It does not establish a room-temperature allowance for a mixed HCG vial.

Keep the storage instructions with the medication

• Keep the carton and pharmacy label so the product and its storage range are easy to identify.
• Record the mixing date and the pharmacist's discard date rather than relying on memory.
• Before traveling, ask your pharmacist how to keep your particular medication within its labeled temperature range.
• Ask for advice if the instructions on the package and those you were given appear to conflict.

Can you freeze HCG to make it last longer?

Pregnyl's U.S. label says not to freeze it. Freezing is not a way to extend that labeled storage period. If a vial froze, ask the dispensing pharmacist or manufacturer what to do before using it.

Does a 5,000 IU vial have different storage rules?

The unit strength alone does not identify the formulation, diluent or storage instructions. Check the specific product label. For help identifying an item from an order, use our contact page; a pharmacist should resolve medication-storage questions.

HCG is not FDA-approved for weight loss. For that separate question, see the FDA's guidance on HCG diet products.