NIH COVID-19 treatment analysis

• NIH reviewed very few RCTs for low-cost treatments, while claiming insufficient evidence
• Only three high-profit drugs from top lobbying companies were found beneficial

Authority review was extremely slow and overlooked most research Official treatment recommendations were often made based on a small fraction of the evidence, with substantial bias in the selection of studies. Just as 78% of experts polled regarding the origin of COVID-19 were not familiar with the DEFUSE protocol4, experts on COVID-19 treatments were not familiar with much of the key evidence. In some cases, recommendations were made without reviewing any clinical evidence, for example the US FDA recommended against ivermectin in an article that stated "The FDA has not reviewed data to support use of ivermectin in COVID-19"5. In cases where the people involved in recommendations are known, they were often busy professionals that could not realistically have time to carefully review all evidence6.
NIH treatment analysis
Treatment NIH status Studies referenced
Vitamin D Insufficient evidence 5 of 138 4%
Vitamin C Insufficient evidence 6 of 72 8%
Zinc Insufficient evidence 3 of 40 8%
Metformin Insufficient evidence 4 of 114 4%
Fluvoxamine Against 6 of 21 29%
Curcumin No analysis 0 of 28 -
PVP-I No analysis 0 of 21 -
Melatonin No analysis 0 of 18 -
Quercetin No analysis 0 of 9 -
N. Sativa No analysis 0 of 15 -
c19early.org
Table 1. The NIH did not review most evidence for low-cost treatments—reviewing 2% of studies (5% of RCTs), while including very low quality studies.
With 500+ therapeutic targets and 12,000+ proposed treatments, what is the probability that only 3 high-profit drugs from companies with strong US lobbying are beneficial?
NIH reviews NIH treatment reviews were done by a panel of 40+ external experts with extensive conflicts of interest towards high-profit treatments6,7. Out of 12,139 proposed treatments8, they found only three high-profit drugs from top lobbying companies to be beneficial for early treatment(a). Most others received either "insufficient evidence" or no review at all, despite extensive unreviewed evidence.
Across all low-cost treatments (within the 227 we cover), the NIH only referenced 2% of the studies. For vitamin D, the NIH claims "insufficient evidence ... to recommend either for or against"9. No authors are listed, they provide only a brief narrative review, and they reference only 5 of the 138 controlled studies (41 RCTs). The state is similar or worse for other treatments (Table 1). The NIH provides no quantitative analysis for any of the treatments listed.
Considering RCTs for vitamin D, the NIH references only 410-13 of 41 (Figure 114). The NIH selection does not have above average relevance or quality, for example including two very late treatment studies using bolus doses of cholecalciferol11,12—a trifecta of poor design and low relevance compared to recommended use: early treatment is better, continuous dosing is more effective than bolus doses, and calcifediol, calcitriol, or analogs avoid long delays in conversion. They include none of the early treatment RCTs. We provide similar analysis for vitamin C15 and zinc16.
October 2026

Vitamin D RCTs missing in NIH analysis

StudyImprovementRR · 95% CIOutcomeTreatmentControlRelative Risk
Early treatment31%0.69 · 0.53–0.9044/22861/22631% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.0056
Entrenas Ca.. (RCT)85%0.15 · 0.01–2.93death0/502/26COVIDIOL< STUDY MISSING > Rastogi (RCT)53%0.47 · 0.24–0.92viral+6/1619/24SHADE< STUDY MISSING > Murai (DB RCT)−49%1.49 · 0.55–4.05death9/1196/118 Sabico (RCT)−192%2.92 · 0.12–69.43death1/380/35LD2< STUDY MISSING > Soliman (RCT)63%0.37 · 0.09–2.78death7/403/16< STUDY MISSING > Elamir (RCT)86%0.14 · 0.01–2.63death0/253/25 Maghbooli (DB RCT)40%0.60 · 0.15–2.38death3/535/53< STUDY MISSING > Leal-Martínez (RCT)86%0.14 · 0.03–0.80death1/407/40CT1< STUDY MISSING > Beigm.. (SB RCT)89%0.11 · 0.01–1.98death0/304/30ICU patients CT1< STUDY MISSING > Bishop (DB RCT)85%0.15 · 0.01–2.78progression0/653/69REsCue< STUDY MISSING > Cannata-An.. (RCT)−44%1.44 · 0.76–2.72death22/27415/269COVID-VIT-D< STUDY MISSING > Torres (SB RCT)−7%1.07 · 0.07–16.60death1/411/44LD2< STUDY MISSING > Mariani (DB RCT)−124%2.24 · 0.44–11.29death5/1152/103CARED Singh (DB RCT)45%0.55 · 0.30–1.01death11/4520/45Shade-S< STUDY MISSING > Karonova (RCT)86%0.14 · 0.01–2.66ICU0/563/54< STUDY MISSING > Cervero (SB RCT)−7%1.07 · 0.07–16.60death1/411/44LD2< STUDY MISSING > Zurita-C.. (SB RCT)79%0.21 · 0.03–1.59death1/206/25< STUDY MISSING > De Niet (DB RCT)65%0.35 · 0.04–3.10death1/213/22< STUDY MISSING > Lakkireddy (RCT)61%0.39 · 0.08–1.91death2/445/43see notes< STUDY MISSING > Sarhan (RCT)19%0.81 · 0.75–0.90death26/5830/58LD2< STUDY MISSING > Bychinin (DB RCT)27%0.73 · 0.47–1.14death19/5227/54COVID-VITICU patients< STUDY MISSING > Domazet B.. (RCT)21%0.79 · 0.55–1.13death30/7539/77ICU patients< STUDY MISSING > Jaun (DB RCT)50%0.50 · 0.04–4.53death1/392/39LD2< STUDY MISSING > Taslim (SB RCT)71%0.29 · 0.11–0.77oxygen4/3014/30LD2< STUDY MISSING > Salman (RCT)60%0.40 · 0.16–1.00death6/15015/150< STUDY MISSING > Seely (DB RCT)48%0.52 · 0.10–2.71progression2/424/44CT1< STUDY MISSING > Sanz (DB RCT)80%0.20 · 0.01–3.74death0/112/11< STUDY MISSING > Abdelhai (RCT)83%0.17 · 0.08–0.37death8/17022/80LD2< STUDY MISSING > Ganmaa (DB RCT)4%0.96 · 0.73–1.26misc.863 (n)884 (n)VIVID< STUDY MISSING >
Late treatment40%0.60 · 0.47–0.76167/2,623263/2,51240% lower risk
Tau² = 0.13, I² = 44.2%, p < 0.0001
Prophylaxis28%0.72 · 0.56–0.945/19,56017/21,04428% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.015
All studies35%0.65 · 0.55–0.77216/22,411341/23,78235% lower risk
Tau² = 0.06, I² = 30.0%, p < 0.000100.511.52+
1 CT: study uses combined treatment
2 LD: comparison with low dose treatment
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← Vitamin D
reduces risk
Vitamin D
increases risk →
NIH ANALYSIS:
90% OF RCTs MISSING
Figure 1. NIH vitamin D analysis—37 RCTs missing.
October 2026

Vitamin C RCTs missing in NIH analysis

StudyImprovementRR · 95% CIOutcomeTreatmentControlRelative Risk
Early treatment30%0.70 · 0.54–0.9070/21046/12530% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.0059
Late treatment19%0.81 · 0.70–0.9588/2,309163/1,94119% lower risk
Tau² = 0.02, I² = 31.2%, p = 0.0073
All studies20%0.80 · 0.69–0.92158/2,519209/2,06620% lower risk
Tau² = 0.02, I² = 30.9%, p = 0.001600.511.52+
1 CT: study uses combined treatment
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← Vitamin C
reduces risk
Vitamin C
increases risk →
NIH ANALYSIS:
70% OF RCTs MISSING
Figure 2. NIH vitamin C analysis—14 RCTs missing.
October 2026

Zinc RCTs missing in NIH analysis

StudyImprovementRR · 95% CIOutcomeTreatmentControlRelative Risk
Early treatment21%0.79 · 0.45–1.4120/28925/28921% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.44
Late treatment35%0.65 · 0.24–1.805/1069/11235% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.42
Prophylaxis50%0.50 · 0.33–0.7434/69367/67550% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.0006
All studies42%0.58 · 0.43–0.8059/1,088101/1,07642% lower risk
Tau² = 0.00, I² = 0.0%, p = 0.0007800.511.52+
1 OT: comparison with other treatment
2 CT: study uses combined treatment
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← Zinc
reduces risk
Zinc
increases risk →
NIH ANALYSIS:
75% OF RCTs MISSING
Figure 3. NIH zinc analysis—6 RCTs missing.
Waiting for RCTs costs lives While the NIH examined few of the RCTs, they dismissed almost all observational studies. RCTs can provide significant advantages, however they show no benefit for COVID-19 and they introduce significantly delay. For the 227 treatments analyzed, there is no difference in results between RCTs and observational studies, RR 0.97 [0.91‑1.03]17 (Figure 4). Observational studies do not systematically over- or underestimate efficacy, as found in previous research18,19, and they provided confirmation of efficacy 8+ months faster. RCTs aim to equalize study groups, but add their own biases. For acute diseases with strong benefits for earlier treatment, the typical increased treatment delay adds a major confounding factor. Both RCTs and observational studies span the bias spectrum, from minimal to extreme. Studies must be evaluated individually. While observational studies require greater expertise to analyze, the advantages in practicality, cost, time, and ethics are substantial.
Across 227 treatments
Low-cost0.98 0.90‑1.06
High-profit0.93 0.85‑1.02
All treatments0.97 0.91‑1.03
0 0.5 1 1.5 2
← RCTs show
higher efficacy
RCTs show →
lower efficacy
Figure 4. For COVID-19 there is no significant difference between the results of observational studies and RCTs17.
Waiting for specific outcomes costs lives While patented treatments may be approved with a single non-clinical result20, authorities often dismiss results for low-cost treatments where studies report different outcomes. To avoid delay and unnecessary mortality, we must use all available evidence. Logically, minimizing viral replication will minimize serious outcomes. Singh et al.21 confirm, showing improved viral clearance significantly associated with lower hospitalization/death. We confirm this across all 227 treatments—improved viral clearance is strongly associated with lower serious outcomes, p = 0.00000000015 (see the appendix for details). Authorities may not pool any outcomes, e.g., separating studies reporting mortality and studies reporting ICU admission, however data shows that—for COVID-19—it is valid to combine outcomes from viral clearance to mortality. 85% of treatments showing significant efficacy/harm with pooled effects have been confirmed without pooling, with a mean delay of 4.6 months.
Novel treatments are high risk, existing treatments have a critical safety advantage Existing treatments have a strong advantage with known pharmacokinetics and safety profiles. New agents are more risky. Long-term risks cannot be known, and known risks may not be acknowledged for some time. For example, molnupiravir's potential risks include the creation of dangerous variants22-26, mutagenicity, carcinogenicity, teratogenicity, and embryotoxicity27-41. While the risk always exceeded the benefits within the context of all treatments, and confirmation of harm continues to accumulate, the treatment is still used in 2026 in some locations. Novel treatments saw limited use during the pandemic42,43, partly due to prescription requirements, limited availability, high cost, and, for certain treatments, administration requirements and drug interactions.
c19early.org

Low-cost existing treatments

Can reduce risk
Known safety profile
More widely available
Available immediately
Can be distributed in advance for immediate treatment

High-profit novel treatments

Can reduce risk
Inherently risky—long-term and rare side effects unknown
High cost limits use
Limited production
High profit incentivizes unethical behavior
Substantial delay for development and testing
Delayed treatment due to access barriers
Contact.
Contact us on X at @CovidAnalysis.
Funding.
We have received no funding or compensation in any form, and do not accept donations. This is entirely volunteer work.
Conflicts of interest.
We have no conflicts of interest. We have no affiliation with any pharmaceutical companies, supplement companies, governments, political parties, or advocacy organizations.
AI.
We use AI models (Gemini, Grok, Claude, and ChatGPT) tasked with functioning as additional peer-reviewers to check for errors, suggest improvements, and review spelling and grammar. Any corrections are manually verified. Our preference for em dashes is independent of AI.
Updates.
Our COVID-19 meta-analyses involve the extraction of over 228,000 datapoints from thousands of papers for 227 treatments. We thank the thousands of scientists, physicians, and other contributors that have provided updates, suggestions, feedback, and corrections. These are all welcome and can be submitted below.
Dedication.
This work is dedicated to top evidence-based physicians that worked tirelessly to analyze evidence and greatly reduce mortality and morbidity during the pandemic. In alphabetical order: Dr. Thomas J. Borody, Dr. Mary Talley Bowden, Dr. Flavio Cadegiani, Dr. Shankara Chetty, Dr. Ryan Cole, Dr. George Fareed, Dr. Sabine Hazan, Dr. Pierre Kory, Dr. Tess Lawrie, Dr. Robert Malone, Dr. Paul Marik, Dr. Peter McCullough, Dr. Didier Raoult, Dr. Harvey Risch, Dr. Jackie Stone, Dr. Brian Tyson, Dr. Joseph Varon, and Dr. Vladimir Zelenko.
Public domain.
This is a public domain work distributed in accordance with the Creative Commons CC0 1.0 Universal license, which dedicates the work to the public domain by waiving all rights worldwide under copyright law. You can distribute, remix, adapt, and build upon this work in any medium or format, including for commercial purposes, without asking permission. Referenced material and third-party images retain any original copyrights or restrictions. See: https://creativecommons.org/publicdomain/zero/1.0/.
 
Monoclonal antibodies were also included in earlier versions. Other treatments such as dexamethasone, tocilizumab, and baricitinib were recommended for late stage hospitalized patients.
secure.medicalletter.org, secure.medicalletter.org/TML-article-1702e.