Groundnut Oil and Peanut Processing in Nigeria (2026)

Groundnut oil processing in Nigeria starts long before the press. The single biggest quality risk is not the machine but the raw nut: damp, mouldy or damaged groundnuts can carry aflatoxin, and buyers and regulators take that seriously. This guide explains how groundnut oil and other peanut products are made, the checks that matter, equipment categories, packaging and how to reach bulk buyers. We give no costs, yields or margins, because they vary with your nut supply, machine and scale.

Why raw material quality comes first

An ICRISAT policy brief from April 2018, produced with ICRISAT Nigeria and the Mycotoxicology Society of Nigeria, says groundnut is the most common host of aflatoxin worldwide, and reports that at least 30 percent of groundnut grains and seeds sold in local markets were contaminated in the studies it cites. It also reports that the European Union rejected groundnuts from Nigeria for aflatoxin and recommends that processors maintain hygienic conditions, dry crops adequately, and acquire testing facilities. Read it at the ICRISAT repository. The brief also notes that hand-shelled groundnut had lower aflatoxin B1 than mechanically shelled seed in the data it reviews, which is a reminder that shelling damage matters. Because figures differ by study and season, ask a laboratory for current testing options and never assume a lot is clean.

Groundnut oil processing, step by step

FAO's guide Quality assurance for small-scale rural food industries and its publication on minor oil crops describe the stages:

1. Check and buy raw nuts. FAO says the first step in the quality system is to confirm incoming seed is properly dried and shows no mould, sampling several bags with a thief sampler, preferably before buying.
2. Sort and clean. Remove stained, darkened, shrivelled and discoloured seeds and foreign matter.
3. Dehusk (shell). FAO says groundnuts must be de-husked before extraction.
4. Break and heat (cook). Seed is milled and heated in a scorcher or cooker to rupture oil cells.
5. Press. FAO lists ram presses, plate presses and powered screw expellers.
6. Settle and filter. Crude oil contains moisture, dirt and gums; small mills let it settle in closed drums for a few days, then siphon or decant and filter through fine cloth.
7. Pack and store. FAO suggests sealed airtight tins or bottles, protected from light, in a cool place.

The press cake left behind is used in local dishes, secondary products or animal feed, according to FAO, so plan where it will go. FAO also states that aflatoxin tends to concentrate in the oil cake rather than in the oil, so do not sell contaminated cake as food or feed without testing and advice. The FAO pages are at fao.org (quality assurance, oilseeds) and fao.org (principles of oil extraction).

Quality tests and storage

FAO says the key oil quality tests are rancidity and free fatty acid levels, and that light, heat, moisture, moulds, enzymes and metals such as copper and iron speed rancidity. It adds that high rancidity or free fatty acids often trace back to stale raw material, so check stocks regularly. Store seed in a well-ventilated store, off the ground, protected from birds, insects and rodents, and keep oil away from light and heat. FAO's Post-harvest Compendium for groundnut says buyers often specify 6 to 8 percent kernel moisture, and that loose-shelled kernels deteriorate faster in storage than in-shell nuts. Quoted aflatoxin limits vary by importing country, so get your buyer's limit in writing.

Sorting and shelling

FAO's groundnut compendium lists sorting methods that include screening, air separation, specific gravity separation, colour sorting and magnetic separation for metal. It says foreign material of 5 percent or more reduces the value of farmers' stock, and notes that rain before drying, immature pods, shrivelled pods and damaged pods all promote mould. Fast, complete drying and removal of damaged or foreign material reduce the risk. Loose-shelled kernels deteriorate faster than in-shell nuts, so plan to shell close to the time you press. Keep a log of each purchase: supplier, date, moisture and the result of any test.

Equipment categories

• Sorting tables, a cleaner or winnower, and a sheller.
• A mill or crusher and a cooker or scorcher.
• An oil expeller or press.
• Settling tanks or drums, and filters (cloth or a filter press).
• Bottling or drumming equipment, scales, and a dry store for seed.

Expellers vary widely in capacity and in how much oil they leave in the cake. Ask suppliers for written capacity data and spare-parts support.

Registration for groundnut oil processing

Bottled groundnut oil sold under your brand needs NAFDAC registration. SON's 2024 to 2029 list of certified food products includes a groundnut oil entry, so a certification route exists. Start with our guides on NAFDAC registration and SON MANCAP certification. NAFDAC's Public Alert 039/2025 (2 December 2025) warns about unregistered edible oils sold in several cities; buyers expect a registration number and named producer on the label, so do not skip this step. Confirm current requirements with NAFDAC.

Cost drivers, not cost figures

We do not quote prices, yields or margins. The main cost drivers are nut purchase and testing, shelling, fuel or power for the cooker and expeller, filtering and settling losses, bottles or drums, labels and registration. Work through each with real quotes before you commit, and test your own oil-to-nut ratio on a small run.

Peanut products beyond oil

Many processors also sell roasted nuts, groundnut paste or kuli-kuli. The ICRISAT brief reports high aflatoxin contamination in kuli-kuli and roasted groundnut samples in the studies it cites, which underlines why sorting, drying and testing come first for every product. See also our guide to exporting sesame seeds for a comparable oilseed export route, and packaging, labelling and shelf life.

Who buys groundnut oil and peanut products in bulk

• Wholesalers and distributors who buy drums or cartons of bottled oil.
• Supermarkets that want registered, labelled bottles.
• Restaurants, caterers and food manufacturers who buy by the drum.
• Exporters who need test reports.

Give each buyer a sample, a lab report, an MOQ and tiered pricing; see MOQs and price tiers.

Frequently asked questions

What is the main risk in groundnut processing? Aflatoxin from damp, mouldy or damaged nuts, according to FAO and ICRISAT.

Does aflatoxin end up in the oil? FAO says it tends to concentrate in the cake. That does not make unsafe nuts acceptable; test and sort.

How do I filter groundnut oil? FAO describes settling in closed drums then decanting and filtering through fine cloth at small scale.

Can I mix old and new nuts? FAO links high rancidity to stale raw material, so avoid it.

Getting started

If your groundnut oil processing is producing oil and peanut products that are sorted, tested and packed, apply to supply at /apply-manufacturer. It is free to apply, with review stated at about 24 to 48 hours. Choose the category that fits your products, list MOQs and tiered prices, and respond to buyer requests. You arrange and pay for delivery, and we cannot promise orders.