Let's compare it to Gas-X, which it's active ingredient Simethicone which is a mixture of polydimethylsiloxane and hydrated silica gel, and silica gel is silicon dioxide. We can ignore silicon dioxide which is well known as inert and used everywhere in pharma and food industry. I could not find out the ratio, but did find a blurb that polydimethylsiloxane should be between 90.5 to 99 % of the compound? The extra strength Gas-x label indicates 500 mg max in one day. (The tabs are 125mg, so that's 4 tabs max per day).
30mL of polydimethylsiloxane or rather dimethylpolysiloxane is just under the density of water, so lets assume worst case so 30mL is equal to 30g (real number would be around 29.1g). Let's also assume worst case in that none of the fermcap is lost in the brew process to make 10 gal.
30g/10gal = 3g/gal
3g/8pints = 375mg/pint
It looks like 1 pint could be the equivalent of taking 3 gas-x tabs at once. So does that mean it is within acceptable limits?
Although I would not drink more than 1 pint a day and only with meals, keep out of reach of children and pregnant persons.
If it does effect head retention that may be a good indication of how much passed through the process.
Based on worst case assumptions and if you can't find more precise information I'd be inclined to throw it out. Maybe a call to fermcap-S would help.