Most of the concern re: pressure treated wood goes back to the practice of treating the wood with CCA (arsenic) but that was banned by n 2004. Unlikely you’ll find any pt wood with that these days. Now they use copper which the body needs tint amounts of anyway. Here’s a couple links - 2 are older and one from 2018. I’m certain there is prob more scientific analysis out there.
EDIT - you can seal or line the internal surfaces with plastic if it will allay any concerns.
	
	
		
			
				
					
						
							
						
					
				
			
			
				
					
						
							 www.naturalhandyman.com
						
					
					www.naturalhandyman.com
				
			
		
	
	
	
		
			
				
					
						
							
						
					
				
			
			
				
					
						
							 extension.oregonstate.edu
						
					
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							 wooditsreal.com
						
					
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								EDIT - you can seal or line the internal surfaces with plastic if it will allay any concerns.
Safely Using Pressure Treated Wood for Garden Frames
Pressure treated wood can be safely used for above ground raised garden frames
				Raised bed lumber, pressure treated safe?
 
					
				Vegetable Gardening With Pressure Treated Lumber? Yes You Can! - Wood. It's Real.
Pressure-treated Southern Yellow Pine is a great choice for planters because it ensures your project will last for years. Best of all, it’s safe for growing food. See why.
				 wooditsreal.com
						
					
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 Believe it or not they are essential for honey bees . Before other plants start flowering  dandelions  are an important source of pollen and nectar.
  Believe it or not they are essential for honey bees . Before other plants start flowering  dandelions  are an important source of pollen and nectar. 
 
		 
 
		 
			 
			 
			 
			 
			 
			