What is the best method for taking NMN? #5

At the time of recording there are two methods of taking Nicotinamide Mononucleotide (NMN), they are:

·      Orally, by ingesting/swallowing NMN in either capsule form or by mixing it into a liquid or food

·      Sublingually, by placing NMN powder under the tongue and allowing it to diffuse into the bloodstream through the soft tissue

Is there any scientific proof that confirms that one method is better that the other?