The Community Supplement Library
These are supplements your community takes — and you probably do too. They didn't qualify for an evidence tier. We include them because kashrut verification still matters regardless of whether we can grade the evidence.
What this page is and isn't. We make no efficacy claim for any product listed here. We don't rank them. We don't compare them. We verify their kashrut status, flag the known kashrut pitfalls for each supplement category, and point you to certified brands. What you take is your decision — we just want it to be an informed one. See our evidence-graded rankings →
Vitamin B12
Universal supplement, critical for anyone on metformin, strict plant-based diets, or over age 60 (absorption declines). Methylcobalamin or adenosylcobalamin preferred over cyanocobalamin.
- Typically pareve and widely OU/OK certified
- Sublingual tablets: check for gelatin binder
- Injections: confirm preparation is kosher (some use animal-derived albumin)
- Maxi-Health B12, Freeda B12, Country Life B12 all certified
B-Complex
B1, B2, B3, B5, B6, folate, B12, biotin together. Mainstay of the community market — Maxi-Health and Freeda have built entire product lines around this. No longevity RCT evidence; genuine nutritional insurance.
- Maxi-Health, Freeda, Country Life all carry OU/OK certification
- Check capsule shell — prefer HPMC pareve over gelatin
- Biotin occasionally derived from non-kosher fermentation — verify
Vitamin C
Universally taken. Antioxidant, collagen synthesis cofactor, immune support. No longevity RCT evidence in non-deficient adults. Ascorbic acid is synthetic = pareve. Most brands widely certified.
- Plain ascorbic acid: pareve, widely OU/OK certified
- Buffered forms (calcium ascorbate, sodium ascorbate): pareve
- Bioflavonoid complexes: check citrus extract certification
- Gummies: almost always chametz/kitniyot or gelatin — avoid
Zinc
Immune function, wound healing, testosterone support, taste/smell. Widely taken in the community. Zinc glycinate or picolinate preferred for absorption. Long-term high dose depletes copper — monitor.
- Zinc salts are mineral — inherently pareve
- Check capsule shell and excipients
- Zinc lozenges: check sweeteners and binders
- Pure Encapsulations Zinc, Thorne Zinc all carry certification
Iron
Essential for women with heavy periods, pregnancy, or confirmed deficiency. Do not supplement without a serum ferritin test — excess iron is harmful. Bisglycinate or liposomal iron preferred for GI tolerance.
- Iron salts are mineral — inherently pareve
- Avoid liquid iron preparations with grape juice base — requires kosher wine supervision
- Freeda Iron, Maxi-Health Iron both certified
- Separate from calcium supplements by 2 hours — absorption interference
Probiotics
Gut microbiome support. Significant kashrut complexity — dairy cultures, non-kosher growth media, and gelatin capsules are all common pitfalls. Most commercial probiotics are not acceptable without explicit certification.
- Dairy cultures are common even in "non-dairy" probiotics — must verify Chalav Yisrael status
- Growth media often contains non-kosher animal derivatives
- Gelatin capsule common — require HPMC or certified kosher gelatin
- Only use brands with explicit probiotic-specific kosher certification
- Maxi-Health Probiotic, Jarrow (select SKUs with OU) are safer starting points
Collagen Peptides
Widely taken for skin, joints, and hair. Derived from animal connective tissue — significant kashrut concern. Bovine, porcine, and marine sources each carry different halachic status. Plant-based "collagen builders" are not collagen.
- Bovine collagen: must be from kosher-slaughtered animals — very few certified options
- Porcine collagen: not acceptable
- Marine (fish) collagen: requires OU-Fish or equivalent; pareve if from kosher fish
- Great Lakes Wellness Kosher Collagen (OU certified beef) is a leading option
- Always verify the current lot — sourcing can change between production runs
Multivitamins
The baseline of the community supplement market. Maxi-Health and Freeda Vitamins were built specifically for the kosher consumer. No longevity RCT evidence; serves as nutritional insurance for common dietary gaps.
- Maxi-Health — extensive OU-certified line
- Freeda Vitamins — OU certified, iron-free options
- Country Life Kosher — large certified line
- Check for vitamin D3 source (lanolin vs lichen) and vitamin A form (retinyl palmitate vs beta-carotene)