Search & Compare Supplements - by Bioavailability
We grade nutrient forms to reveal true absorption — not just milligrams.
IM8 Daily Ultimate Essentials Pro is a high-density all-in-one supplement sachet with strong bioavailable nutrient forms, probiotics, postbiotics, CoQ10, MSM, saffron and functional blends. Its main weakness is hidden dosing inside several complex blends.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 900 mcg | High |
| Vitamin C | 900 mg | High |
| Vitamin D | 50 mcg | High |
Foundation Daily is a wellness-oriented daily multivitamin that combines bioactive vitamins and minerals with turmeric, garlic, piperine, and vitamin K2 MK-7. This review focuses on ingredient forms, bioavailability, chelated minerals, price per serving, and whether the formula justifies its premium positioning versus stronger high-potency multis.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 900 mcg RAE | Medium |
| Vitamin C | 200 mg | High |
| Vitamin D | 50 mcg (2000 IU) | High |
21st Century One Daily Men’s Health is a low-cost, once-daily men’s multivitamin with broad basic coverage, lycopene, and a gluten-free, non-GMO product claim. Its main advantage is price and convenience: one tablet per day, 100 servings per bottle, and a budget-level cost per serving. The trade-off is formula quality. The product uses several standard vitamin forms and a fully non-chelated mineral profile, including calcium carbonate, magnesium oxide, zinc oxide, copper oxide, manganese sulfate, chromium chloride, sodium selenate, and potassium iodide. With a Bioavailability Index of 3.12, this is best understood as a basic budget multivitamin rather than a high-bioavailability men’s formula.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 900 mcg | High |
| Vitamin C | 99 mg | High |
| Vitamin D | 25 mcg (1,000 IU) | High |
Pure Encapsulations Nutrient 950 Without Iron is a broad-spectrum practitioner-style multivitamin built around high nutrient coverage, strong core vitamin forms, and a generally quality-focused profile. Standout choices include Metafolin® (L-5-MTHF), methylcobalamin, selenomethionine, zinc picolinate, copper glycinate, and citrate minerals. With a Bioavailability Index of 4.18, the formula looks stronger than a generic multivitamin, but it is not uniformly premium across every ingredient. This review examines the real strengths and weak links of Pure Encapsulations Nutrient 950 Without Iron, including its mixed niacin strategy, extended trace mineral tail, chelation reality, and proprietary carotenoid blend. The product makes the most sense for users who want a serious iron-free multivitamin with broad practitioner-style coverage, not a minimalist one-a-day formula.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 2,250 mcg | Medium |
| Vitamin C | 500 mg | High |
| Vitamin D | 10 mcg (400 IU) | High |
Viviscal is a marine-based hair supplement built around AminoMar™, a clinically studied complex designed to reduce shedding and support thicker, fuller-looking hair over time. Taken twice daily for 3–6 months, it’s best for diffuse thinning / increased shedding—expect gradual improvement, not instant regrowth.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin C | 59 mg | High |
| Vitamin B3 | 12 mg NE | High |
| Biotin | 120 mcg | High |
California Gold Nutrition Two-A-Day is a high-potency, two-capsule multivitamin built for users who care about bioavailable B-vitamin delivery and methylation-friendly folate, pairing methylcobalamin (B12) with L-5-MTHF (methylfolate) and coenzyme-style B forms as a streamlined daily foundation.
It’s most attractive for people who prefer veggie capsules and want a practical antioxidant/eye layer, including a meaningful 10 mg lutein dose, while the mineral panel stays focused on high-impact essentials like zinc (25 mg) and selenium yeast (200 mcg) rather than a heavy mineral load. Magnesium is modest (105 mg) and delivered as a mixed oxide + bisglycinate blend, so it functions as baseline coverage instead of a dedicated magnesium supplement.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 1500 mcg | Up. Medium |
| Vitamin C | 270 mg | High |
| Vitamin D | 50 mcg | High |
Pure Encapsulations O.N.E.™ Multivitamin is a practitioner-grade, once-daily multivitamin for men and women 18+ that focuses on real bioavailability, not label noise. It combines highly absorbable vitamins A, B, C, D and E with methylated folate (L-5-MTHF), methylcobalamin and a meaningful 50 mg dose of sustained-release CoQ10 to support cellular energy, cardiovascular health and methylation in one hypoallergenic capsule per day
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 1,125 mcg | Up. Medium |
| Vitamin C | 180 mg | High |
| Vitamin D | 50 mcg (2,000 IU) | High |
SmartyPants Kids Formula, Cherry Berry, 120 Gummies is a premium kids multivitamin for ages 4–8 that packs methylfolate, methylcobalamin, vitamin D3, vitamin K2 MK-7 and omega-3 EPA/DHA into four easy gummies a day — using clean-label, highly bioavailable forms to cover key vitamin and iodine gaps, while staying light on minerals and adding 5 g of sugar per serving so parents still need to watch overall diet and cavity risk.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 180 mcg | Up. Medium |
| Vitamin C | 45 mg | High |
| Vitamin D | 20 mcg (800 IU) | High |
Children’s Formula Life Extension Mix is a smart, chewable multivitamin for kids 4–8 (suitable as a base for 9–13), combining clean taste with science-driven forms. It centers on highly absorbable chelated minerals (zinc, selenium, molybdenum), safe vitamin A as β-carotene, and a generous B-complex — no added sugar. Designed to simplify daily nutrition while you manage food quality, it flags common gaps (vitamin D, calcium/K, omega-3s) so parents can top up what matters, not guess.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 1050 mcg RAE | Medium |
| Vitamin C | 120 mg | High |
| Vitamin D | 10 mcg | High |
Nutrafol Women’s Hair Growth, 120 Capsules — a drug-free, multi-targeting hair supplement for women 18–44 that addresses stress, DHT, and micro-inflammation via two proprietary blends (Synergen Complex® + Nutrafol® Blend). The formula includes 2 chelated minerals out of 3 - Zinc (Amino Acid Chelate) and Selenium (L-Selenomethionine) - plus Iodine from organic kelp to help cover common nutrient gaps. Take 4 capsules with a meal daily. * ✳️ Sub-ingredient doses are proprietary.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Protein | 1 g | Variable |
| Vitamin A | 1500 mcg RAE | Medium |
| Vitamin C | 100 mg | High |
Solgar VM-75 ⚠️ markets “chelated minerals” and delivers very high B-vitamin doses, but several form choices weaken absorption: Vitamin D is D2 (not D3), B12 is cyanocobalamin, and both magnesium and zinc blend chelates with oxides. A tiny “herbal base” is present in milligram-level amounts. Net: decent everyday multi, but not ideal if you prioritize best-absorbing forms.
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 2250 mcg | Medium |
| Vitamin C | 250 mg | High |
| Vitamin D | 10 mcg (400 IU) | Medium |
Nature’s Way Alive! Men's Ultra Multivitamin ⚠️ is marketed as an "ultra-complex" multivitamin designed specifically for men, but realistically blends basic vitamins and minerals with numerous marketing-focused ingredient blends in negligible doses. Almost all proprietary blends have very low bioavailability 📉, thus failing to deliver claimed health benefits. Essential minerals for men's health, such as zinc, selenium, and folate, are presented in inexpensive and less effective forms. The supplement is safe but ineffective, making it overpriced compared to basic alternatives. ❌
Key Ingredients
| Ingredient | Amount | Bioavailability |
|---|---|---|
| Vitamin A | 1,350 mcg | Up. Medium |
| Vitamin C | 203 mg | High |
| Vitamin D | 50 mg | High |