Why all the controversy?? Silicon dioxide is everywhere folks 
I found this:  
FOOD ADDITIVE DETAILS  		 
Silicon dioxide, amorphous (551)    
Synonym(s) 
Silica 
Functional Classes 
Anticaking agent 
 Search JECFA  
Click the above link to search the JECFA database for the specifications of additive(s) with INS No. 551   
GSFA Provisions for Silicon dioxide, amorphous 
Number 
Food Category 
Max Level 
Notes 
		01.8.2	Dried whey and whey products, excluding whey cheeses	10,000 mg/kg		 
		11.1.2	Powdered sugar, powdered dextrose	15,000 mg/kg	 
 Note 56  
		12.1.1	Salt	GMP		 
Note: Unless otherwise specified, food additive provisions apply to the food category indicated (e.g. Dairy), as well as to all subcategories of that category (e.g. Cheese, Ripened Cheese, etc.).   
GSFA Table 3 Provisions 
Silicon dioxide amorphous is a food additive that is included in Table 3, and as such may be used in the following foods under the conditions of good manufacturing practices (GMP) as outlined in the Preamble of the Codex GSFA. Note that food categories listed in the Annex to Table 3 were excluded accordingly. 
Number 
Food Category 
		01.1.2	Dairy-based drinks, flavoured and/or fermented (e.g., chocolate milk, cocoa, eggnog, drinking yoghurt, whey-based drinks)	 
		01.3	Condensed milk and analogues (plain)	 
		01.4.3	Clotted cream (plain)	 
		01.4.4	Cream analogues	 
		01.5	Milk powder and cream powder and powder analogues (plain)	 
		01.6.1	Unripened cheese	 
		01.6.2	Ripened cheese	 
		01.6.4	Processed cheese	 
		01.6.5	Cheese analogues	 
		01.7	Dairy-based desserts (e.g., pudding, fruit or flavoured yoghurt)	 
		01.8.1	Liquid whey and whey products, excluding whey cheeses	 
		02.2.2	Fat spreads, dairy fat spreads and blended spreads	 
		02.3	Fat emulsions mainly of type oil-in-water, including mixed and/or flavoured products based on fat emulsions	 
		02.4	Fat-based desserts excluding dairy-based dessert products of food category 01.7	 
		03.0	Edible ices, including sherbet and sorbet	 
		04.1.2	Processed fruit	 
		04.2.2.2	Dried vegetables (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), seaweeds, and nuts and seeds	 
		04.2.2.3	Vegetables (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), and seaweeds in vinegar, oil, brine, or soybean sauce	 
		04.2.2.4	Canned or bottled (pasteurized) or retort pouch vegetables (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), and seaweeds	 
		04.2.2.5	Vegetable (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), seaweed, and nut and seed purees and spreads (e.g., peanut butter)	 
		04.2.2.6	Vegetable (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), seaweed, and nut and seed pulps and preparations (e.g., vegetable desserts and sauces, candied vegetables) other than food category 04.2.2.5	 
		04.2.2.8	Cooked or fried vegetables (including mushrooms and fungi, roots and tubers, pulses and legumes, and aloe vera), and seaweeds	 
		05.0	Confectionery	 
		06.3	Breakfast cereals, including rolled oats	 
		06.4.3	Pre-cooked pastas and noodles and like products	 
		06.5	Cereal and starch based desserts (e.g., rice pudding, tapioca pudding)	 
		06.6	Batters (e.g., for breading or batters for fish or poultry)	 
		06.7	Pre-cooked or processed rice products, including rice cakes (Oriental type only)	 
		06.8	Soybean products (excluding soybean-based seasonings and condiments of food category 12.9)	 
		07.0	Bakery wares	 
		08.2	Processed meat, poultry, and game products in whole pieces or cuts	 
		08.3	Processed comminuted meat, poultry, and game products	 
		08.4	Edible casings (e.g., sausage casings)	 
		09.3	Semi-preserved fish and fish products, including mollusks, crustaceans, and echinoderms	 
		09.4	Fully preserved, including canned or fermented fish and fish products, including mollusks, crustaceans, and echinoderms	 
		10.2.3	Dried and/or heat coagulated egg products	 
		10.3	Preserved eggs, including alkaline, salted, and canned eggs	 
		10.4	Egg-based desserts (e.g., custard)	 
		11.6	Table-top sweeteners, including those containing high-intensity sweeteners	 
		12.2.2	Seasonings and condiments	 
		12.3	Vinegars	 
		12.4	Mustards	 
		12.5	Soups and broths	 
		12.6	Sauces and like products	 
		12.7	Salads (e.g., macaroni salad, potato salad) and sandwich spreads excluding cocoa- and nut-based spreads of food categories 04.2.2.5 and 05.1.3	 
		12.8	Yeast and like products	 
		12.9	Soybean-based seasonings and condiments	 
		12.10	Protein products other than from soybeans	 
		13.3	Dietetic foods intended for special medical purposes (excluding products of food category 13.1)	 
		13.4	Dietetic formulae for slimming purposes and weight reduction	 
		13.5	Dietetic foods (e.g., supplementary foods for dietary use) excluding products of food categories 13.1 - 13.4 and 13.6	 
		13.6	Food supplements	 
		14.1.4	Water-based flavoured drinks, including "sport," "energy," or "electrolyte" drinks and particulated drinks	 
		14.2.1	Beer and malt beverages	 
		14.2.2	Cider and perry	 
		14.2.4	Wines (other than grape)	 
		14.2.5	Mead	 
		14.2.6	Distilled spirituous beverages containing more than 15% alcohol	 
		14.2.7	Aromatized alcoholic beverages (e.g., beer, wine and spirituous cooler-type beverages, low alcoholic refreshers)	 
		15.0	Ready-to-eat savouries	 
		16.0	Composite foods - foods that could not be placed in categories 01 - 15	 
Note: Unless otherwise specified, food additive provisions apply to the food category indicated (e.g. Dairy), as well as to all subcategories of that category (e.g. Cheese, Ripened Cheese, etc.).