Answers are grounded in this paper and cite their sources.
A W Hsing, G W Comstock, B F Polk; Effect of repeated freezing and thawing on vitamins and hormones in serum., Clinical Chemistry, Volume 35, Issue 10, 1 Octobe
No takes yet. Share an insight, caveat, or question.
Hsing et al. (1989) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: