Biotics Research Bio-D-Mulsion Forte Vitamin D -- 2000 IU - 1 fl oz by Biotics Research. $19.95. Bio-D-Mulsion Forte is an oil-in-water emulsion. Vitamin D oil has been dispersed into microscopic particles to aid absorption and assimilation. Bio-D-Mulsion Forte - same as Bio-D-Mulsion except each drop supplies 2,000 IU of emulsified vitamin D3.