The 5 Best Online Stores to Buy Supplements

Buying supplements online should be simple, but it rarely feels that way. You click through a store, find a product that looks promising, and then spend the next 20 minutes wondering if the price is fair, if the shipping will take forever, or if the brand is even reputable. Most people end up settling for whatever shows up first on a search engine, which is a gamble when you are putting something into your body.

The good news is that a handful of online retailers have built their businesses around making this process easier. Some focus on athletes. Others cater to general wellness. A few have carved out space by offering hard-to-find brands or individual servings so you can test before committing to a full supply. This guide breaks down 5 stores worth your attention, starting with the one that has earned its place at the top.

The Feed has positioned itself as the go-to destination for endurance athletes, and the model works. With over 300 brands on the platform, including more than 15 that you cannot find anywhere else, the selection alone sets it apart. But the real appeal comes from how the store is structured.

Most supplement retailers force you to buy full boxes or containers. The Feed lets you purchase individual servings. This means you can test a new energy gel, hydration mix, or protein bar without committing $40 to a product you might hate. For athletes who are constantly tweaking their nutrition strategy, this flexibility matters.

The store also has a partnership with USA Triathlon that gives members an $80 credit when they join. That is a meaningful perk for competitive athletes who are already spending money on race registrations, gear, and coaching.

The Feed has accumulated over 1,537 customer reviews on Trustpilot with a rating of 3.6 out of 5 stars. Some customers have noted shipping delays, with a few reporting orders taking 2 to 3 weeks to arrive. Trustpilot has also flagged that the platform may solicit reviews in ways that could introduce bias. These are fair points to consider, though the product selection and athlete-focused approach still make it the strongest option for serious competitors.

If you train for marathons, triathlons, cycling events, or ultra-distance races, The Feed speaks your language in a way that general retailers do not.

iHerb has been around since 1996, and its staying power comes from scale. The catalog is enormous, covering everything from protein powders to herbal extracts to organic snacks. If you are looking for a specific brand or a niche product, iHerb probably has it.

The platform ships to over 180 countries, which makes it a practical choice for buyers outside the United States. Pricing tends to be competitive, and the site runs frequent promotions that can shave 10% to 20% off orders.

Customer feedback for iHerb is generally positive, particularly around shipping speed and product authenticity. The interface can feel overwhelming because of the sheer number of products, but filters and reviews help narrow things down.

iHerb works best for people who want variety and do not mind browsing through a massive inventory. It is less curated than The Feed, which means you are doing more of the research yourself.

Amazon is the default shopping option for most people, and supplements are no exception. Prime members get fast shipping, Subscribe & Save discounts can reduce costs by 5% to 15%, and the review system provides a quick sense of product quality.

The complication comes from third-party sellers. Amazon operates as a marketplace, which means the person selling a protein powder might be the brand itself, an authorized retailer, or some random reseller with questionable inventory practices. Counterfeit and expired products have been documented across supplement categories.

If you buy from Amazon, stick to products sold directly by the brand or by "Amazon.com" as the seller. Check the expiration date as soon as the package arrives. Read negative reviews carefully because they often reveal issues that positive reviews gloss over.

Amazon is fine for repurchasing products you already know and trust. For discovery or for anything where authenticity matters, other retailers offer more peace of mind.

Vitacost occupies a different space than athlete-focused stores. The selection leans toward everyday vitamins, minerals, and general wellness products. Think multivitamins, fish oil, magnesium, and probiotics.

The pricing is where Vitacost earns its reputation. Discounts of 20% to 50% off retail prices are common, and the store runs regular promotions on top of that. If you are stocking up on basics like vitamin D or a daily multivitamin, Vitacost often beats competitors on price.

The site also carries organic and natural food products, cleaning supplies, and personal care items. This makes it useful for bundling orders and hitting free shipping thresholds.

Vitacost is not the place to find the latest endurance nutrition or performance-focused supplements. But for standard daily supplements at lower prices, it delivers.

Bodybuilding.com started as a fitness content site and expanded into retail. The store focuses on performance nutrition for strength athletes, bodybuilders, and general gym-goers. Pre-workout formulas, protein powders, creatine, and recovery supplements dominate the catalog.

The site integrates educational content with product pages, which can help if you are researching ingredients or comparing formulas. Workout programs and nutrition guides live alongside the store, creating a resource that goes beyond simple transactions.

Pricing is competitive with other major retailers, and the brand selection covers most of the big names in sports nutrition. Exclusive deals and product launches sometimes hit Bodybuilding.com before appearing elsewhere.

If you lift weights and want a store that understands your goals, Bodybuilding.com fits. For endurance athletes or general wellness shoppers, the catalog will feel narrow.

The best retailer depends on what you are buying and why. Athletes training for endurance events benefit from The Feed's specialized selection and single-serving options. General wellness shoppers find better prices at Vitacost. International buyers lean on iHerb for accessibility. Convenience shoppers default to Amazon, and strength athletes gravitate toward Bodybuilding.com.

A few principles apply regardless of where you shop:

Check expiration dates. Supplements lose potency over time, and some retailers move old inventory through discounts.

Read the negative reviews. Positive reviews tell you what works. Negative reviews tell you what breaks, tastes terrible, or causes digestive issues.

Start small. Buying individual servings or small containers lets you test before committing. The Feed makes this easy, but other retailers sometimes offer sample sizes or trial packs.

Verify the seller. On marketplaces like Amazon, the seller matters as much as the product. Third-party sellers introduce risk that direct retailers avoid.

The supplement market has more options than anyone needs, which makes choosing a retailer feel harder than it should be. But narrowing your focus to stores that match your goals simplifies the decision.

The Feed earns the top spot because it combines a deep catalog with features designed for athletes who care about performance. The ability to buy single servings, access to exclusive brands, and the USA Triathlon partnership create a package that other retailers cannot match. Shipping concerns appear in some customer feedback, so factor that into your timing if you need products by a specific date.