RALEIGH, N.C.—Triangle Capital Corp., a specialty finance company that provides customized financing solutions to lower middle market companies located throughout the United States, closed a $10.5 million subordinated debt investment with warrants in Botanical Laboratories Inc., developer, manufacturer, marketer and distributer of branded and private label vitamins, minerals and nutritional supplements. Botanical Laboratories, with offices in Ferndale, Wash., has been providing products under its Wellesse brand of liquid supplements since 1988.