I add only limewater.
I used to add Iodide but quit several months ago since I saw no benefit.
I used to add Thiel's Vital Gold but quit several months ago after seeing no benefit. Here's a list of ingredients in his snake oil:
Vitamin B1, B2, B6, B12 (hydroxo-variety), C, Bioflavenoids, Folate, Choline, Biotin, Pangamic acid, Soluble A and E, Pantothenate, Niacin, Nicotinic acid, Inositol, PABA, Dimethylglycine, Chromium (GTF and picolinate), Antioxidants (Cysteine, CoQ10, C, Citrus bioflavenoids), Papain, Bromelain, Amylase, Protease, Lipase, Octacosanol, Leucine, Valine, Alanine, Tyrosine and other amino acids, Calcium, iron, zinc, copper in less than 0.01 ppb, Cholecalciferol, Boron, Lithium, Molybdenum, Strontium, Kelp extracts, Selenium, Vanadium, Rare earth minerals, Procyanadins, some calcium, Catechins, Allicin, Garlic extract, Capsicum, Herbal extracts, all elements normally found in trace element suplementation (76), GHF, Selenocystine, low sulphur selenocysteine, SGOT animal extract, polyunsaturated fatty acids, potassium, magnesium, glutathione, methionine, citric acid, gluconic acid, aspartic acid, arginine, carotenoid extracts, omega-3 fatty acids, capsicin, other anti-oxidants than the ones mentioned, many herbal extracts in non alcohol form, Chorella extract, Suma, ginger root extract, lecithin, and organic complex nutrients as found in fish meal extracts.
If you have a spare kitchen sink, you could throw it in to make it complete.
I still have most of a bottle left in the 'fridge...
Mark