That math checks out. Keep in mind that most major health organizations are saying something like this about the safe levels of total daily intake:
Intakes up to 400mg per day (about 5.7mg/kg bw per day) consumed throughout the day do not raise safety concerns for healthy adults in the general population>
Not saying you should change what you're doing, just putting it out there for everyone
The same convention is true on liverys for aircraft