"His weight right now is 190lbs "

How tall is he?

"Actually I stopped giving him cod liver oil last night "

Why? Does he hate the taste? If so, he could get vitamins A and D from capsules or tablets. Vitamins A and D are very important.

"He gets calcium and magnesium from fruit juices."

Fruit juices? I have seen some orange juice with added calcium. I haven't seen any with added magnesium. While fruit juices are good sources of potassium, they are high in sugar, and not a good idea for a low carbohydrate diet. Fruit juices are also high in calories, especially if one uses them instead of water.
Imo he should stop drinking fruit juices and stop eating fruit, and eat vegetables instead. Fruit juices are worse than eating fruit, since they don't even have the fiber, and juices tend to be from the sweetest varieties of fruit.

Many doctors prescribe ALA even when people have amalgams. It is not a good idea though, as it might mobilize mercury into the brain.