Authorities in Lagos have discovered the fifth illegal methamphetamine production centre in just one year, deepening fears Nigeria is a narcotics hub and part of a worldwide network.
The anti-drugs agency says the West African country is producing meth on a large scale.
The highly addictive drug is known by several names, including meth, ice and crystal. It is usually injected, but it can also be smoked or inhaled.
Mild doses can increase alertness and concentration, but high doses can cause psychological problems including paranoia and hallucinations.
Nigeria used to be a transit point through which illegal drugs from Mexico passed on their way to Europe.
Mitchell Ofojeyu, a spokesman for the Nigerian Drug Law Enforcement Agency, said: "They have an international network because they're bringing in Bolivians into West Africa to produce Methamphetamine; [it] shows the synergy the drug cells in West Africa have with their counterparts in other regions of the world."

In an exclusive report, Al Jazeera's Mohammed Adow visits the lab where the methods of concealment for the drug dealers are as diverse as the narcotics they traffic.
Reporting from Lagos, Adow said: "While manufacturing drugs is a new phenomenon in Nigeria using it as a trafficking hub is not."