Key Things to Look for When Choosing Vitamins and Supplements
Truth Full HealthHow to Make Safe, Informed, and Smart Decisions
Dietary supplements (vitamins and supplements) can play a role in overall wellness, but not all products are created equal. With thousands of options available, it’s essential to choose supplements based on safety, quality, transparency, and scientific credibility.
This guide highlights key considerations when selecting dietary supplements, along with our recommended ratings based on their value to consumers.
Supplement Selection Criteria
| Feature | Why It Matters | Consumer Importance (5 Stars = very important; 1 star = least important) |
|---|---|---|
| Manufacturing Facilities Follow Current Good Manufacturing Practice (cGMP) for Supplements | Ensures adherence to FDA-required manufacturing standards for supplements, which supports product safety and quality. | ⭐⭐⭐⭐⭐ |
| Facilities Follow cGMP for Food | Adds assurance of hygiene and safety, following food-grade practices. | ⭐⭐⭐⭐ |
| FDA-Registered Facility | Shows the facility is registered with the FDA and subject to inspections; provides basic regulatory oversight.a | ⭐⭐ |
| Third-Party Quality Certifications | Provides assurance that product quality has been independently reviewed and certified.a | ⭐⭐⭐⭐⭐ |
| Third-Party Testing | Confirms products are tested for potency, purity, and potential contaminants by an independent lab. | ⭐⭐⭐⭐⭐ |
| Ingredient Transparency (such as fillers, binders, and additives) | Helps consumers avoid ingredients they may be sensitive to. | ⭐⭐⭐⭐⭐ |
| No Preservatives | Appeals to consumers who prefer products with fewer, more natural ingredients.b | ⭐⭐⭐ |
| No Sugar | Preferred by individuals managing blood sugar or limiting sugar intake. | ⭐⭐⭐⭐⭐ (for those managing intake); personal preference otherwise |
| Natural vs. Artificial Sweeteners | Can impact taste, calories, and how healthy the product seems. | Personal preference or health-context dependentc |
| Natural vs. Artificial Flavor | Offers transparency for those avoiding artificial additives. | Personal preferenced |
| Natural vs. Synthetic: Key Ingredients | May influence perceptions of purity or effect. | Personal preference or health-context dependente |
| Natural vs. Artificial Color | Some consumers choose to avoid artificial colors due to emerging health concerns.f | ⭐⭐⭐ |
| GMO vs. Non-GMO | Reflects a preference to avoid genetically modified ingredients.g | Personal preference |
| USDA Organic Certified | Assures organic farming practices, chemical-free and eco-friendly products.h | Personal preference |
| Gluten-Free | Essential for people with gluten intolerance or celiac disease. | ⭐⭐⭐⭐⭐ (for targeted consumers); personal preference otherwise |
| Vegan / Vegetarian | Important for those avoiding animal-derived ingredients. | ⭐⭐⭐⭐⭐ (for plant-based consumers); personal preference otherwise |
| Allergen-Free (either fully or specific, such as nut-free or gluten-free) | Crucial for individuals with allergies or concerned about allergens. | ⭐⭐⭐⭐⭐ (for targeted consumers); personal preference otherwise |
| Diary/ Lactose-Free | Important for lactose-intolerant individuals or those avoiding dairy | ⭐⭐⭐⭐⭐ (for targeted consumers); personal preference otherwise |
| Sodium-free | Suitable for those managing sodium intake. | ⭐⭐⭐⭐⭐ (for sodium-restricted diets); personal preference otherwise |
| Manufactured in USA | Offers transparency and perceived oversight in domestic production. | ⭐⭐⭐⭐ |
| Expert-Backed Formulation (such as doctor, pharmacist or dietitian involvement) | Serves as a sign of quality or responsible formulation. | ⭐⭐⭐⭐ |
| Customer reviews | Offers insights into consumer experiences. | ⭐⭐⭐⭐ |
| Point of Purchase (such as pharmacy vs. online) | Affects convenience and ability to physically inspect products. | ⭐ |
| Science-Backed Ingredients | A key factor in assessing potential safety and health benefits of the product | ⭐⭐⭐⭐⭐ |
aOnly about 5% of US dietary supplement manufacturing facilities are audited by the FDA each year for compliance with cGMP.[1]
bWhile small amounts of preservatives are generally considered safe, some may be linked to potential health risks when consumed in large quantities or over time[2],[3],[4]
cArtificial sweeteners typically have fewer or no calories compared to natural sweeteners – a potential benefit. However, some animal studies have linked them to cancer risk.[5] That said, multiple health authorities including the FDA, Health Canada, and the European Food Safety Authority, have concluded that there is no clear evidence of cancer risk in humans.[6]
dThere is no strong evidence that natural flavors are healthier than artificial ones. Both are regulated for safety, and no significant health differences have been shown.[7],[8]
eThe amount of nutrients our body absorb (“bioavailability”) can vary significantly depending on whether they come from natural or synthetic sources. For example, natural vitamin E (from food) is better absorbed than the synthetic form, while synthetic folic acid is absorbed more easily than folate from natural food sources. [9],[10] It’s also important to note that higher absorption isn’t always better – and balance matters.
fSome synthetic food dyes have been associated with hyperactivity and behavioral issues in some children, and certain dyes show a correlation with cancer in animal research.[11],[12] The FDA has announced plans to phase out artificial food dyes in favor of natural alternatives by 2026. Overall, choosing natural colors may reduce potential health risk.
gLeading organizations such as the US FDA, World Health Organization, and National Academy of Sciences state that GMO products are generally safe.[13],[14],[15] GMO products typically go through a voluntary consultation process with the FDA and are not subject to formal pre-market approval. In addition, the cultivation of GMO crops may be associated with increased herbicide use.[16] Considering these factors, we rate the importance of non-GMO (vs. GMO) as “Personal preference.”
hStudies suggest that organic foods may contain lower levels of pesticide residues and fewer drug-resistant bacteria, with emerging evidence pointing to possible health benefits. [17],[18],[19] However, no major health organizations have declared a definitive health advantage of organic over conventional products. Therefore, we rate this feature as “Personal preference.”
A Note About Assessing Our Health Risk
Beyond ingredients that pose clear health risks for specific individuals (like allergens or unsafe levels of heavy metals), some features we’ve discussed involve potential tradeoffs between health and convenience — including:
- Artificial colors
- Artificial sweeteners
- Sugar and other natural sweeteners
- Sodium
- Certain preservatives
- Other non-active ingredients
While the amount consumed from supplements is typically small compared to regular food, the challenge is that most people don’t track their total intake across products.
That makes it difficult to know when small amounts from supplements could add up and push us past recommended limits — especially for things like sodium, sugar, or certain additives.
In situations like this, a good general practice is to reduce unnecessary exposure to added risks by choosing supplement products that avoid these extra ingredients when possible.
Another helpful approach is to be aware of what health effects supplements may contribute — positively or negatively — and keep track of any changes to your health status.
Be sure to discuss these with your healthcare provider (HCP) during routine visits.
In some cases, the tradeoff may involve two choices that both carry potential health risks, such as natural versus artificial sweeteners.
In these situations, we recommend speaking with your HCP to evaluate which option poses the greater risk given your current health status.
Finally, among all the factors we consider, the greatest source of uncertainty in supplements is product quality.
Quality has a major impact on both safety and health benefits — which is why we give all quality-related features a high importance rating (4 to 5 stars).
Final Thoughts
This overview covers key features to consider when evaluating dietary supplements.
At Truth Full Health, we acknowledge that individual needs and circumstances may vary.
With that in mind, we believe the following features are among the top considerations when selecting dietary supplements:
- Manufacturing Facilities Follow Current Good Manufacturing Practice (cGMP) for Supplements
- Third-Party Quality Certifications
- Third-Party Testing
- Ingredient transparency
- Science-backed ingredients
While not exhaustive, we hope it offers a helpful starting point for you to make informed, confident choices.
We’ll be sharing more detailed, evidence-informed guides on these topics in future updates.
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Stay happy and healthy!
Sincerely,
Derek Tang, PhD, MS, BSPharm
Truth Full Health
Your Trusted Supplement Partner
*Disclaimer: all blogged content is for informational purposes only and does not replace professional medical advice. The statements made regarding dietary supplements (vitamins and supplements) have not been evaluated by the Food and Drug Administration (FDA). These products are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare provider before beginning any new supplement, diet, or health regimen. Any references to specific products or studies are for illustrative purposes and do not constitute an endorsement or guarantee of effectiveness.
[1] Long J. FDA audits climb in FY22 for dietary supplement facilities. SupplySide SJ. Published October 12, 2022. https://www.supplysidesj.com/supplement-regulations/fda-audits-climb-in-fy22-for-dietary-supplement-facilities. Accessed March 8, 2025.
[2] Title: Potential role of antioxidant food supplements, preservatives and colorants in the pathogenesis of allergy and asthma. First author: D. Zaknun. Journal: International Archives of Allergy and Immunology.
Year of publication: 2012.
[3] Title: Food preservatives – an overview on applications and side effects. First author: M. Silva. Journal: Emirates Journal of Food and Agriculture. Year of publication: 2016.
[4] Canadian Institute of Food Safety. Understanding food preservatives: What are the health risks? Food Safety Canada Blog. Published November 16, 2021. https://blog.foodsafety.ca/food-preservatives-what-are-health-risks. Accessed March 8, 2025.
[5] Demarco C & Blackburn KB. Artificial sweeteners vs. natural sweeteners: Which one is better? MD Anderson Cancer Center. Published March 25, 2025. https://www.mdanderson.org/cancerwise/artificial-sweeteners-vs--natural-sweeteners--which-one-is-better.h00-159774867.html. Accessed December 14, 2025.
[6] US Food and Drug Administration. Aspartame and other sweeteners in food. Updated February 27, 2025. https://www.fda.gov/food/food-additives-petitions/aspartame-and-other-sweeteners-food. Accessed December 14, 2025.
[7] Environmental Working Group. Natural vs artificial flavors. https://www.ewg.org/foodscores/content/natural-vs-artificial-flavors/. Accessed December 14, 2025.
[8] Nutrition Sciences, University of Wisconsin–Madison. Natural and artificial flavors. Published July 26, 2021. https://nutrisci.wisc.edu/2021/07/26/natural-and-artificial-flavors/. Accessed December 14, 2025.
[9] National Institutes of Health Office of Dietary Supplements. Vitamin E—Health Professional Fact Sheet. Updated March 26, 2021. https://ods.od.nih.gov/factsheets/VitaminE-HealthProfessional/. Accessed December 14, 2025.
[10] Office of Dietary Supplements, National Institutes of Health. Folate: Fact sheet for health professionals. Updated November 22, 2022. https://ods.od.nih.gov/factsheets/Folate-HealthProfessional/. Accessed December 14, 2025.
[11] Title: Food additives and hyperactive behaviour in 3-year-old and 8/9-year-old children in the community: a randomised, double-blinded, placebo-controlled trial. First author: D. McCann. Journal: The Lancet. Year of publication: 2007.
[12] Van Thomme G. Are food dyes unhealthy? MD Anderson Cancer Center. Published April 25, 2025. https://www.mdanderson.org/cancerwise/are-food-dyes-unhealthy.h00-159775656.html. Accessed December 14, 2025.
[13] National Academies of Sciences, Engineering, and Medicine. Do foods made with GMOs pose special health risks? Published May 2, 2022. https://www.nationalacademies.org/based-on-science/foods-made-with-gmos-do-not-pose-special-health-risks. Accessed December 14, 2025.
[14] World Health Organization. Food, genetically modified. Updated May 1, 2014. https://www.who.int/news-room/questions-and-answers/item/food-genetically-modified. Accessed December 14, 2025.
[15] US Food and Drug Administration. GMO crops, animal food, and beyond. Updated March 5, 2024. https://www.fda.gov/food/agricultural-biotechnology/gmo-crops-animal-food-and-beyond. Accessed December 14, 2025.
[16] Title: Use of Genetically Modified Organism (GMO)-Containing Food Products in Children. First author: SA Abrams. Journal: Pediatrics. Year of publication: 2024.
[17] Title: Global trends in antimicrobial resistance on organic and conventional farms. First author: EO Ager.
Journal: Scientific Reports. Year of publication: 2023
[18] Mayo Clinic. Organic foods: Are they safer? More nutritious? Updated February 28, 2025. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/organic-food/art-20043880. Accessed December 14, 2025.
[19] Title: A Comprehensive Analysis of Organic Food: Evaluating Nutritional Value and Impact on Human Health. First author: A Rahman. Journal: Foods. Year of publication: 2024.