Between 1933 and 1934 not only Haworth and fellow British chemist ( later Sir ) Edmund Hirst had synthesized vitamin C , but also , independently , the Polish chemist Tadeus Reichstein , succeeded in synthesizing the vitamin in bulk , making it the first vitamin to be artificially produced .
In 1933\/1934 , the British chemists Sir Walter Norman Haworth and Sir Edmund Hirst , and separately the Polish Tadeus Reichstein , successfully synthesized the vitamin .