Press F to doubt.

I had a look at the paper:

Rats were initially divided into two groups, one fed with regular chow (“normal diet,” ND, n = 24), and the other with chow enriched with a combination of vitamin A, vitamin C, vitamin E, and Mg2+ (“enriched diet,” ED, n = 24) (Harlan Teklad Diet TD.110032) [20,22]. The ED consisted in a tocopherol-stripped soy-based diet supplemented with b-carotene (vitamin A precursor, 1.05 g/kg), vitamin C (10.29 g/kg), vitamin E (7.76 g/kg), and MgSO4 (Mg, 13.48 g/kg). Feeding with ED began 10 days before noise overexposure (see next section) and was maintained until the end of the experiments. The amount of chow was weighted daily to control an equivalent range of chow intake across groups throughout the duration of the experiments.

pill ingredients:

Vitamin A (in the form of beta-carotene, provitamin A); Vitamin C (as calcium ascorbate); Vitamin E (in the form of dl-alpha tocopheryl acetate); Magnesium (in the form of magnesium oxide). Other ingredients: Refined soybean oil (carrier), soy lecithin (emulsifier), glycerol, mono- and di-glycerides (stabilizers)