Is Vitamin C Common Cold Meta-Analysis safe?

The current Migaku evidence database contains 2 reusable source documents for Vitamin C Common Cold Meta-Analysis. This answer focuses on safety, limits, and clinician-discussion contexts. - We conducted a preliminary search of PubMed, Embase, Cochrane Library, and Web of Science databases, reviewing evidence from their inception to February 17, 2025 on the role of nutritional supplements in preventing respiratory tract infections (RTIs) among adults, with no language restrictions. [Zhu Zhixin (2025); evidence level 1] - No network meta-analysis (NMA) was found that systematically compared the full range of nutritional interventions for RTI prevention. [Zhu Zhixin (2025); evidence level 1] - Incorporating 107 randomized controlled trials (RCTs) with 101,751 participants, this study provides a substantially larger evidence base than previous reviews. [Zhu Zhixin (2025); evidence level 1] - Eligible participants were adults aged 18 or older, taking oral nutritional supplements, and free of immune-related diseases. [Zhu Zhixin (2025); evidence level 1] - 1 2 (,) 3 () Vitamin C (ascorbic acid) is a key micronutrient that is found naturally in many fruits and vegetables. [Hemilä Harri (2026); evidence level 2] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.