A man has been arrested in relation to supplying synthetic drugs in Levin.

A 26-year-old has been charged with supplying a psychoactive substance after a police search of his Manakau address uncovered a pump-action shotgun, 56 rounds of ammunition and nearly 4kg of material used to manufacture synthetic drugs.

Detective sergeant Karen Heald, of Levin CIB, said the drug seizure was of significant quantity and once manufactured these materials would have an estimated street value of $100,000.

"Synthetic drugs cause significant harm to the community and can be fatal to users.

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"Police are committed to holding those responsible for manufacturing and dealing these dangerous substances to account," she said.

"We encourage anyone with information in relation to its manufacture and supply to contact police."

The man was granted bail and is to appear in the Levin District Court on November 16.