was any trial conducted in relation to this?
Yes, human trials were conducted to study scurvy.
Scurvy
Notable human dietary studies of experimentally induced scurvy have been conducted on conscientious objectors during World War II in Britain and on Iowa state prisoner volunteers in the late 1960s. 
what is durian? It is the fruit of from tree species belonging to the genus "Durio". where is it found? Borneo and Sumatra. what are its types? Mon Thong, Chantaburi No. 1, Chantaburi No. 3, D24 and XO. is it nutritious? Yes, it contains proteins, carbohydrates, vitamin C, and manganese. does it have a smell? Yes, an unusual and disagreeable odour. can you name any other two food items which contains the mentioned vitamin? Guava, broccoli. which disease is caused due to its deficiency? Scurvy. does its intake causes any side effects? Nausea, abdominal cramps and diarrhea. any other cause of the mentioned disease other than deficiency? Malnutrition and poor dietary choices. how is it treated? By preventing dehydration, low blood sugar, low body temperature, infection, correct electrolyte imbalances and micronutrient deficiencies.
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Scurvy [SEP] Human trials
Notable human dietary studies of experimentally induced scurvy have been conducted on conscientious objectors during World War II in Britain and on Iowa state prisoner volunteers in the late 1960s. These studies both found that all obvious symptoms of scurvy previously induced by an experimental scorbutic diet with extremely low vitamin C content could be completely reversed by additional vitamin C supplementation of only 10 mg per day. In these experiments, no clinical difference was noted between men given 70 mg vitamin C per day (which produced blood levels of vitamin C of about 0.55 mg/dl, about of tissue saturation levels), and those given 10 mg per day (which produced lower blood levels).