Eight-Week Vitamin D Supplementation at 4000 IU/Day Is Insufficient to Improve Speed and Power in Professional Female Soccer Players
M MM; M G; R R; W M; A B; M G; G Z · 2026 · Preprint
WASTE classifies this as Negative / Null Result Report · AI classification, approximate
The study found no significant effect — useful as a negative control or null benchmark for your own design.
Abstract (excerpt)
Background: Vitamin D optimizes musculoskeletal function and athletic performance, yet optimal supplementation protocols remain unclear. Methods: In this double-blind RCT, 18 professional female soccer players were randomized during autum…
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Metadata source: Europe PMC · DOI 10.20944/preprints202605.0091.v1