Hey Amy,
Good on you for taking the initiative with these vitamins and micronutrients for your kids.
The following slight modifications to the basic anti-inflammatory regimen should be just fine for your kids...
5,000 IU/day vitamin D3*
1,000-1,300 mg/day calcium**
2,000 mg/day Omega 3 Fish Oil***
* Many nutritionists and pediatricians in the know prescribe 4,000 IU/day vitamin D3 for infants...
** The calcium citrate tablets with magnesium, zinc and boron are ideal for kids... Four (4) of the Kirkland brand of calcium citrate tablets a day will be spot on... Meets Calcium, magnesium, zinc and boron RDAs per the charts below
*** Does wonders to lower high cholesterol and high triglycerides. You can also add Nature Made Cholest Off, a mix of natural plant sterols and stanols to help bring down total cholesterol and triglycerides even further.
The following two tables of recommended RDAs for calcium and magnesium supplements come from the Food and Nutrition Board at the Institute of Medicine...
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As far as your kids inheriting CH... Although there's a link... the odds remain very low... Maintaining a healthy serum concentration of 25(OH)D should do the trick to prevent CH even if the odds were much higher...
I'm not a doctor but I think methylphenidate is being over prescribed... In addition two of my kids are teachers. Ryan teaches music and voice in middle school, Jr, High and High School in Boise, Idaho. Gretchen is an Art professor at a small private collage in Southern VA... Both did two year stints in special education.
They take a busman's holiday for a month each summer as senior councilors at Camp Goodtimes West here in the State of Washington on Vashon Island. They've done this for over 20 years since Gretchen beat out ALL... so both spend a good bit of time with kids in need... They also share my concern that CNS stimulants like methylphenidate are being over prescribed...
Accordingly, after your son has been on the vitamin D3 for a month, order the 25(OH)D lab test. If his serum concentration of 25(OH)D is > 40 ng/mL, do your own assessment of his ADHD... If you see what you're looking for, ask his doctor about taking him off the methylphenidate...
Balancing work-home life can be difficult at best these days, but if you can find the time to take him out for a 10 minute jog three to four times a week, you can work off any leftover hyperactivity... The vitamin D3 will give you more energy and a little physical activity will also do wonders in helping you shed a few pounds and inches...

Take care,
V/R, Batch