Say ‘Sup’ to Healthline’s Vitamin and Supplement Testers

Types of supplement testers

• Expert testers | Skip to meet them: Our expert supplement testers are registered dietitians. They’re able to provide insights on what makes a high-quality supplement, and which options might be best for different needs.
• Supertesters | Skip to meet them: Our supertesters have tested at least 10 different vitamins or supplements for Healthline.
• Everyday testers | Skip to meet them: Our everyday testers have tested less than 10 supplements or vitamins for Healthline.

Supplement supertesters

Catherine Conelly

• Types of supplements tested: prenatals, multivitamins, omega oils, electrolytes, magnesium, and vitamin D
• Health focus: pregnancy, postpartum, and breastfeeding

I’m a fan of trying to regulate my body a bit more naturally (even though, yes, I know some vitamins are synthetic). I appreciate that vitamins and supplements can help me proactively manage my overall health and support common needs like deeper sleep, nutrient intake, gut health, and, for my current phase of life, breastfeeding.

As long as there are no high risks or safety concerns (I like to read up on recent studies and expert opinions first), I keep an open mind to natural remedies and wellness trends as a way to stay healthy and energetic. With two kids and a full-time job, it’s a must.

I’ve mainly used magnesium, multivitamins, protein powder, greens and superfood powders, omega-3s, electrolytes, and prenatals.

Kristin Currin

• Types of supplements tested: multivitamins, probiotics, fish oils, greens powders, turmeric, and vitamin D
• Health focus: gut health, anxiety, focus, energy, inflammation

I’m a supplement enthusiast who moonlighted for several years as the vitamin and supplement expert on said aisle at a whole-food grocery.

Several notable brands invited me to workshops to learn about their processes. I geek out on understanding what works in harmony with our bodies.

Personally, I’m also passionate about supplements since I manage chronic neck pain (fibromyalgia) and inflammation, and I’ve had to advocate for my health with specialists.

Chelsea Logan

• Types of supplements tested: protein powders, iron supplements, omega oils, and multivitamins
• Health focus: vegan nutrition, energy and stamina, overall wellness

I have a chronic iron deficiency, so I’ve been taking iron supplements regularly for the past 20 years or so. Currently, I’m rounding out my daily routine with a multivitamin that contains vitamin D and B12 (both vitamins I tend to be low in as a vegan) as well as a plant-based omega supplement. I also regularly consume protein powder.

When shopping for a new supplement, I look for ones that are vegan and third-party tested. After that, I tend to prioritize those that are packaged sustainably. Future Kind checks all my boxes, so I’m a big fan of their products. I also like Naked Nutrition and Garden of Life.

Supplement everyday testers

Alice Porter-McLaughlin

• Types of supplements tested: probiotics, multivitamins, protein powders, greens powders, and omega oils
• Health focus: vegan nutrition, breastfeeding, fitness, gut health, brain health

As a vegan for over 15 years and now a busy breastfeeding mom, my main goals with vitamins are bridging nutritional gaps and supporting my energy levels.

I take daily multivitamins geared toward vegan nutrition and lactation, probiotics to support gut health and immune function, and plant-based omega-3 fatty acids for skin, brain, and eye health.

I aim to use supplements alongside a balanced diet and value the reassurance they offer. I occasionally have greens and superfood powders when I need a nutritional boost.

I generally prefer brands that are committed to quality, purity, and simplicity in their ingredients. I look for organic certification and no synthetic or unnecessary additives. I also consider research-backed formulas, so brands like Thorne, AG1, and FullWell stand out for me.

I’m also interested and open-minded about natural and alternative supplements if they’re proven safe and worthwhile.

Rita Mauceri

• Types of supplements tested: multivitamins for women over 50, probiotics, supplements for hair growth, omega-3 supplements, and 5-HTP
• Health focus: energy, sleep, stress reduction, gut health, menopausal wellness

I’ve tried lots of supplements, but I don’t go overboard. I tend to use them for specific reasons. I eat a really well-rounded, protein-rich diet that provides most of my essential nutrients, but I also love the convenience and reassurance of taking supplements. I’ve found some that work really well for me, and allow me to target some things that have become more important as I age like brain and bone health.

My daily musts are vitamin D3+K2, B-12, cod liver oil, and red yeast rice because I have high cholesterol. I sometimes take probiotics and 5-HTP. I want to try glutathione and adaptogens.

I don’t love taking pills, especially large ones. If a liquid or powder form is available, I will opt for that over adding more pills to my regimen. I also don’t think supplements have to be pricey, so for things like vitamin D or B vitamins, which come at different price points, I tend to go the more affordable route.

Jackie Cruz

• Types of supplements tested: creatine, preworkout, and protein powder
• Health focus: general wellness, exercise performance, athletic performance, muscle growth, muscle recovery, and brain function

In my daily routine, I take AG1 multivitamin powder every morning along with the vitamin D and K drops it comes with. I work out from 7 to 8:30 a.m., and then I take creatine as soon as I get home and get ready to walk my dog. In the evening, I drink a Liquid IV with dinner and take a vitamin B12 supplement.

In terms of favorite brands, I typically look for what is cheap and does not contain heavy metals, although that’s very hard to find.

As an aging, high-performance athlete, I take creatine every day to aid with muscle recovery and growth. I find it boosts my energy levels and endurance. From what I’ve researched, it takes at least one year of taking it every day to see results in cognitive function. Occasionally, I use a pre-workout supplement during a tournament if I feel like my energy levels are dropping and caffeine alone isn’t helping.

Heather Riesebeck

• Types of supplements tested: women’s multivitamins and protein powders
• Health focus: vitamin D & B12 deficiencies, mood & energy boost

When looking for multivitamins, it’s really important to me that they have over the recommended daily value of vitamin D and B12. I have pretty significant deficiencies in those and have been told by my doctor to take a higher dose, so I’m always checking to see if it’s the right amount for me.

Getting my vitamin regimen right has made the biggest difference in my mood and energy levels, and I’ve been taking either a general women’s multivitamin or individual supplements for years.

When it comes to brands, I have no strong preference, but I gravitate toward a drugstore brand like Nature Made or Olly. I’ve taken more expensive vitamins before, and have felt the same impact from more affordable brands, as long as the ingredients are right.

Siobhan DeRemer

• Types of supplements tested: probiotics and multivitamins
• Health focus: gut health

I rely on research and take ingredients and reviews super seriously. I mainly stick to vitamins and supplements that I know can benefit me because I’ve worked with my doctor (vitamin D, multivitamins, probiotics). However, I’m willing to dig into reviews and research to see what might be helpful and isn’t included on my yearly bloodwork. I’ve become especially interested in collagen, biotin, and ways to get more protein as I’m getting older.

When looking for vitamins and supplements to add to my regimen, I check for third-party testing, certifications, and expert reviews first. I tend to avoid buying based on endorsements unless it’s someone I really trust, and I’m always mindful of side effects and how all of these things work together in my body. It can be hard to sift through everything, but sometimes the best are the least flashy!

Shelby Stanley

• Types of supplements tested: multivitamins, creatine, probiotics, L-Theanine, L-Theronate, magnesium, berberine, and melatonin
• Health focus: managing chronic conditions, supporting an active lifestyle, general wellness

I turn to vitamins and supplements to help support my overall wellness, manage stress, and stay active — but I know firsthand how overwhelming the supplement aisle (or website) can be. With so many options out there, I always look for brands that are clear about their ingredients, benefits, and how the product fits into a real daily routine.

As someone with sensitive skin, allergies, and a few health conditions that I manage naturally, I’m extra mindful about what goes in my body. I look for supplements that are transparent, free of unnecessary fillers, and actually help with things like energy, muscle recovery, digestion, and stress management.

Whether it’s sleep support, inflammation relief, or a product to boost performance in the gym, I appreciate formulas that are easy to understand, backed by research, and designed to make a difference in how you feel day to day.

Past testers

Although these testers are no longer actively testing new supplements for Healthline, you may still see their product feedback in our articles.

Kelli McGrane, MS, RD

• Tester type: expert tester
• Credentials: registered dietitian and cookbook author
  Types of supplements: protein powders, creatine, multivitamins, prenatals, greens powders, vitamin D
  Health focus: maintaining weight, pregnancy, general well-being

A guide to our tester badges

Our tester badges help you identify the type of tester reviewing each product. Look for them in our product photos.