1. B Vitamins: These vitamins, particularly B6, B12, and folate, are crucial for energy production and proper brain function, supporting cognitive processes like memory and focus. B vitamins can help increase alertness and decrease anxiety, which can be particularly helpful for children with ADHD. 
2. Omega-3 Fatty Acids: These essential fatty acids, including EPA and DHA, play a vital role in brain development and cognitive function, including learning and memory. 
3. Iron: Iron deficiency can lead to fatigue and difficulty concentrating. Ensuring adequate iron intake is important for children's overall well-being and cognitive function. 
4. Magnesium: Magnesium is involved in nerve and brain function and may help regulate neurotransmitters that support focus and attention. 
5. Vitamin C: Vitamin C is an antioxidant that plays a role in producing norepinephrine, a neurotransmitter that influences attention and reaction speed. 
6. Zinc: Zinc is another essential nutrient for brain health and cognitive function. 
    Before starting any new supplements, especially for children, it's crucial to consult with a pediatrician or healthcare professional to determine the appropriate dosage and to rule out any underlying conditions that might be affecting focus.