Seek evidence-based ingredients like vitamin D, C, zinc, and elderberry at clinically effective doses (e.g., 1,000-2,000 IU D, 500mg+ C) in a high-quality immune booster. Prioritize USP/NSF/FSSAI third-party testing for purity and potency.
Essential Checks
Third-party certifications (USP, NSF, GMP) verify no contaminants/fillers; transparent labeling lists exact potencies vs. vague "%DV." Bioavailable forms (D3 over D2, chelated zinc) ensure absorption; avoid mega-doses risking toxicity (e.g., zinc >40mg).
Red Flags
Sugar/fillers, proprietary blends hiding doses, unproven herbs dominating, or no allergen-free/vegan options if needed. Multi-strain probiotics? Confirm acid-protected capsules.
| Feature | What to Look For |
|---|---|
| Testing | USP/NSF/FSSAI certified |
| Doses | Clinically backed (e.g., zinc 15-30mg) |
| Forms | Bioavailable (e.g., Vit C as ascorbic acid) |
| Additives | None (no fillers/colors) |
| Claims | Science-supported, no "cures" |
Test blood levels first; pair with your probiotic/yogurt routine for synergy.
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