The Chain of Custody covers some mills under the Programme for the Endorsement of Forest Certification (PEFC) stamp, and several under the Forest Stewardship Council (FSC) scheme.
The certification applies to the Finnish paper producer's 21 mills in Austria, Finland, France, Germany, Sweden, Switzerland and the UK.
It said it aims to increase the amount of certified wood in its products, and introduce more accredited products.
Both of M-real's UK mills at Sittingbourne and New Thames in Kent are certified under both the FSC and PEFC schemes.
Forest certification is a voluntary system aimed at promoting sustainable forest management in commercial forests.
Have your say in the Printweek Poll
Related stories
Latest comments
"Thank you for the opportunity to comment on this Jo, and PrintWeek!
Please feel free to get in touch with the Howden Print Team to arrange your own Free of Charge Cyber Micro-Penetration Test to help..."
"I never quite understand the statements such as "achieved such a positive outcome for this well-established business".
The established business unfortunately failed and no longer exists, a..."
"Genuinely sorry to read this."
Up next...

Protocols being strengthened
Software Circle hit by suspected payment fraud

'Precision and reliability'
EBB sets up new publishing wing

Continued investment
Bakers ups BakPac capacity with double Galaxy Packtech install

"Committed to building a stronger Stora Enso"