Suggestions for brands/ websites

To keep it short I’m a 20yo (6’0 : 187Ibs) looking at taking MK. Eating has always been a chore but a friend recommended me to start MK-677 as he saw significant improvements. I dont have any medical predispositions, allergies, injuries, etc. Just worried about some issues with sleep, lethargy, and bloodwork that others have mentioned. Is there a specific website anyone would recommend? Tried Amino asylum and they are out of stock.