Ester won't work for Lead, it only comes out at ~50mg per hour and gets chewed up by Lead.
Swiss is good stuff GMP company but you may be able to find some NowFoods Ascorbic Acid powder which is still Pharma grade.
Once you start DMSA you won't need the C, DMSA even in small doses is much more effective for removing Lead than anything other than AMLA. AMLA works great to remove gut Lead before it enters the bloodstream and worth adding.
Also begin to wonder about being SV40 infected since these heavy lead loads don't happen without help from our owners.