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Head-to-head evidence comparison — which supplement is right for you?
Vitamin D3 wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
4 of 7 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
15 of 26 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Andrographis and Vitamin D3 have evidence — compare verdict strength side-by-side.
400mg extract (standardized to 10-30% andrographolides), 3x daily for acute use
At first sign of cold symptoms, With meals
Standardized extract (10-30% andrographolides)
2000-4000 IU daily
Morning with breakfast
D3 (cholecalciferol) softgel or liquid
2-5 days
2-5 days
2-5 days
4-8 weeks
4-8 weeks
2-4 weeks
4-8 weeks
Herbal Medicines for the Treatment of Active Ulcerative Colitis: A Systematic Review and Meta-Analysis
Nutrients (2024) · Meta analysis
In pooled analyses, when compared with placebo, clinical response rates were significantly higher for Indigo naturalis (IN) (RR 3.70, 95% CI 1.97-6.95), but not for Curcuma longa (CL) (RR 1.60, 95% CI 0.99-2.58) or Andrographis paniculata (AP) (RR 0.95, 95% CI 0.71-1.26).
Safety of Andrographis paniculata: A systematic review and meta-analysis
Pharmacoepidemiology and drug safety (2021) · Meta analysis · n=1000
Incidence of serious AEs was very rare with the pooled incidence (95% CI) from RCTs of 0.02 per 1000 patients (0.0-0.5).
A double-blind, randomized, placebo-controlled study to assess the efficacy of Andrographis paniculata standardized extract (ParActin®) on pain reduction in subjects with knee osteoarthritis
Phytotherapy research : PTR (2019) · Rct · n=103
Patients treated with 300 or 600 mg/day of ParActin® showed a significant reduction in pain at days 28, 56, and 84 compared with a placebo group.
Vitamin D supplementation vs. placebo and incident type 2 diabetes in an ancillary study of the randomized Vitamin D and Omega-3 Trial
Nature communications (2025) · Meta analysis · n=5205
Mean body mass index (BMI) was 27.5 kg/m2 (SD = 5.3), with 51% female and 17% Black race/ethnicity.
Vitamin D Supplementation for Patients with Dysmenorrhoea: A Meta-Analysis with Trial Sequential Analysis of Randomised Controlled Trials
Nutrients (2024) · Meta analysis · n=687
TSA revealed that the current RCTs provide sufficient information.
Vitamin D and respiratory tract infections
BMJ (2017) · Meta analysis · n=11321
12% reduction in respiratory infections overall
Based on RCT showing significant improvement in cough (SMD -0.39) and sore throat symptoms. Conservative effectiveness estimates due to moderate effect sizes in meta-analysis of respiratory infections.
Meta-analysis showed 12% overall reduction in respiratory infections, with greater benefits in severely deficient individuals. Daily dosing more effective than bolus. Conservative estimate assumes most users not severely deficient.
AI-estimated from published studies. Interpret as directional guidance.
Vitamin D3 has a higher evidence score (9/10 vs 8.5/10) and wins in 3 of 3 categories.
For support immune system, Vitamin D3 has a higher relevance score (92 vs 90).
No known interactions between Andrographis and Vitamin D3 have been documented in our database. However, always consult a healthcare provider before combining supplements.