According to this organization, their verification mark means:
Contains the ingredients listed on the label, in the declared potency and amounts
Does not contain harmful levels of specified contaminants
Will break down and release into the body within a specified amount of time
Has been made according to FDA current Good Manufacturing Practices using sanitary and well-controlled procedures
The UPC mark means it is what is says it is. It does not mean you need it, or it is good for you.
According to this source, depending on your location , diet, age, and gender, you may need to worry about:
Vitamin B12 Vitamin D Calcium Omega-3 Fatty Acids Iodine Iron Selenium
You are probably getting enough of everything else from food.
2) https://www.usp.org/verification-services/verified-mark
According to this organization, their verification mark means:
Contains the ingredients listed on the label, in the declared potency and amounts Does not contain harmful levels of specified contaminants Will break down and release into the body within a specified amount of time Has been made according to FDA current Good Manufacturing Practices using sanitary and well-controlled procedures
The UPC mark means it is what is says it is. It does not mean you need it, or it is good for you.