Here's some info on L-lysine (I keep it on hand in the event I develop a virus- especially shingles):
umm.edu/health/medical/altmed/supplement/lysineI never heard of NM dimethyglycine before (but I do take glycine for reasons other than anti-viral) and found this:
www.needs.com/product/NDNL-0605-01/l_DMG_DimethylglycineIt seems like you get more bang for the buck with choice #2