Dr. Berg Review 2026: Strengths, Gaps and Real Costs

Last updated: September 27, 2026 · Originally published September 5, 2026 · Published by Eternal Elixir

Edited by Elaine Fletcher, Researcher

Most pages that come up for a Dr. Berg review in 2026 argue about the man rather than the supplements. This Dr. Berg review does the opposite. It looks at who Eric Berg is in two paragraphs, then spends the rest on what a buyer needs: what the Dr. Berg Nutritionals range covers, what it leaves out, what the testing claims actually say, how the refund policy works, and what the two ingredients it shares with our range really cost per milligram.

Who is Dr. Berg?

Eric Berg is a chiropractor, not a medical doctor. His own site says so in its footer: “Dr. Eric Berg DC is not a medical doctor. He is a chiropractor.” His biography lists a Doctor of Chiropractic degree from Palmer College of Chiropractic in Davenport, Iowa (1985 to 1988), and chiropractic licenses in Virginia, California and Louisiana. He founded the Berg Institute of Health & Wellness, and his books and videos focus on what he calls Healthy Keto and on intermittent fasting.

FoodFacts.org, a fact-checking site that profiles health influencers, reports that he began in private chiropractic practice and later moved away from clinical work to produce content online. The same site fact-checks several of his nutrition claims. That debate is not the subject of this review. A supplement range should be judged on what is in the bottle, what it costs per milligram, and whether it stocks what you are shopping for.

What the Dr. Berg supplement range covers

The Dr. Berg store feed listed 111 items when we read it in September 2026. Seventy are listed as supplements, a count that includes bundles and stacks. The rest are books, digital programs, drinks, foods, oils and hair care. The supplement side is strongest on everyday nutrition. Prices as of Sep 2026:

• Electrolytes. This is the deepest category. Electrolyte Powder with 1,000 mg of potassium and magnesium is $35.99 and comes in several variants, Electrolyte Capsules (160 vegetable capsules) are $24.99, and there are multi-pack bundles.
• Vitamins D and K. D3 & K2 Vitamin is $34.99, and a D3 and K2 liquid in MCT oil (1 fl oz) is $17.99.
• Minerals. Magnesium Glycinate with vitamin D3 is $18.99. Zinc with magnesium, vitamin D3 and selenium (30 mg of zinc, 60 capsules) is $19.99. Sea Kelp Enhanced Iodine (90 capsules) is $32.99 and Trace Minerals Enhanced (60 capsules) is $36.99.
• Digestion and gallbladder. Gallbladder Formula Extra Strength, with ox bile and digestive enzymes (90 capsules), is $36.99, and Advanced Digestive Enzymes (180 capsules) is $25.99.
• B vitamins. Benfotiamine (300 mg, 30-day supply) is $30.99, and there are separate B1 and B12 formulas with a B-complex blend.
• Herbs and other basics. Ashwagandha with BioPerine (90 capsules) is $18.99, and the range also includes creatine, probiotics, cod liver oil, collagen peptides, L-theanine and a whole-food multivitamin ($36.99).

If your list is a multivitamin, electrolytes, magnesium, vitamin D and something for digestion, this range covers it at a fair price. It was built for people following a low-carb or fasting routine, and the product mix shows it.

What the range doesn’t cover: the longevity gap

We searched every product title in the store feed. There is no NMN, no nicotinamide riboside, no trans-resveratrol, no pterostilbene, no spermidine, no Ca-AKG, no glutathione, no shilajit and no tongkat ali. The NAD+ and longevity shelf that most of our readers shop is missing entirely.

The closest product is Niacin (Flushing Form) at $16.99. Niacin is vitamin B3, and the body can use it to make NAD+, so it is a real NAD+ precursor. The product title notes that each capsule now holds 125 mg, and the serving is four capsules (500 mg), for 25 servings per bottle. The directions say to start at one capsule a day, build up to four as tolerated, and take it with food to reduce flushing. It is not one of the newer precursors longevity buyers usually look for, and Dr. Berg doesn’t market it that way.

If the NAD+ category is why you are shopping, our comparison of NAD+ supplements maps that shelf. Eternal Elixir makes NMN 500mg (90 capsules, 500 mg each, $49.99), Nicotinamide Riboside 500mg, Spermidine 10mg, Ca-AKG 500mg and Shilajit 1000mg, none of which Dr. Berg sells.

Is Dr. Berg third-party tested?

Dr. Berg’s product pages make two quality statements. They say products are made in a cGMP facility in the United States. And the TUDCA and niacin pages say every batch is “tested for purity and backed by a COA confirming third-party testing for heavy metals and microbes”.

Two things are worth knowing about that wording. First, the certificate of analysis (COA) is described, not shown. We found no link to a certificate on the TUDCA or berberine product pages, so you can’t check a result against the bottle you receive. Second, the stated testing covers heavy metals and microbes. It doesn’t say the amount of TUDCA or berberine in each capsule is measured against the label. A potency result is the part of a COA that tells you the dose is right.

So the fair answer to the most searched question about this brand is: Dr. Berg says its batches are third-party tested for contaminants, and you can ask for the certificate, but the page doesn’t let you see it. We hold ourselves to the same test. Our product pages state the declared amount and the evidence level for each active, and we don’t post batch reports on the product page either. If batch documentation matters to you, ask any brand for the report that matches your lot number, including us.

Dr. Berg vs Eternal Elixir: TUDCA and berberine compared

Only two ingredients appear in both ranges: TUDCA and berberine. They are the only fair place to compare price, because everything else is a different product doing a different job. The unit below is cost per 500 mg of the labeled active, not cost per capsule, which flatters whichever brand puts less in each one. Prices are each brand’s own, as of Sep 2026.

TUDCA: 250 mg vs 500 mg per capsule

Dr. Berg TUDCA has 250 mg of tauroursodeoxycholic acid per capsule, 30 vegetable capsules per bottle, and a label dose of one capsule a day. The other ingredients are the capsule and magnesium stearate. At $23.99 (the page shows a $28.79 list price), that is $0.80 a day and $1.60 per 500 mg of TUDCA. A bottle lasts 30 days.

Eternal Elixir makes TUDCA 500mg: 500 mg per capsule, 60 capsules, one capsule per serving, with rice flour and a cellulose capsule as the only other ingredients. At $59.99 that is $1.00 per serving and $1.00 per 500 mg, and a bottle lasts 60 days at one capsule a day.

Dr. Berg is cheaper at checkout and costs 60% more per milligram of TUDCA. It also delivers half the TUDCA per capsule. If you want to try TUDCA for a month at a low dose, the Dr. Berg bottle is the smaller outlay. If you plan to take it for longer, or want 500 mg in one capsule, ours costs less per milligram and lasts twice as long. Our ranked TUDCA comparison puts both against the rest of the US market on the same basis, and our TUDCA vs milk thistle guide covers how it differs from other liver-support ingredients.

Berberine: a 600 mg formula vs a 500 mg single ingredient

Dr. Berg Berberine with Ceylon Cinnamon is 60 capsules for $41.99 (the page shows a $50.81 list price). Each capsule has 600 mg of berberine hydrochloride from Berberis aristata bark extract, 50 mg of organic Ceylon cinnamon, 12.5 mg of alpha-lipoic acid, 12.5 mg of magnesium as magnesium glycinate and 5 mg of piperine from black pepper. The directions are one capsule twice a day, 20 to 30 minutes before a meal, so 1,200 mg of berberine a day and a 30-day bottle. That works out to $1.40 a day and $0.58 per 500 mg of berberine.

Eternal Elixir makes Berberine HCl 500mg: 500 mg of berberine HCl from a 20:1 concentrate per capsule, 90 capsules, one capsule per serving, with rice flour and a cellulose capsule. At $49.99 that is $0.56 per 500 mg, and a bottle lasts 90 days at one capsule a day.

The gap per milligram is small, about 5%, and it would be misleading to make more of it. The real choice is formula against single ingredient. Dr. Berg’s capsule adds cinnamon, alpha-lipoic acid and piperine, which suits someone who wants one product to take. Ours is berberine alone, which suits someone stacking it with other products who wants to control each amount. The bigger practical difference is the daily dose on the label: 1,200 mg a day for Dr. Berg against 500 mg a day for ours. Our berberine comparison covers the wider market.

What the research says about TUDCA and berberine

Both shared ingredients have been studied in people. Most of that research, though, enrolled patients with diagnosed conditions under medical care, and those results don’t carry over automatically to healthy adults taking a supplement.

• TUDCA, Kars and colleagues, 2010. 20 adults with a high body mass index took 1,750 mg of TUDCA a day or a placebo for four weeks. Insulin sensitivity in the liver and muscle rose by about 30% with TUDCA and didn’t change with placebo. Markers of cell stress in muscle and fat tissue didn’t change.
• TUDCA, Ma and colleagues, Medicine, 2016. 199 patients with a diagnosed bile-duct condition took 250 mg of TUDCA or of the prescription bile acid UDCA three times a day (750 mg a day) for 24 weeks. The two performed similarly on liver blood tests, and both were well tolerated with comparable side effect rates.
• Berberine, Xie and colleagues, Frontiers in Pharmacology, 2022. A meta-analysis of 37 randomized trials with 3,048 patients who had a diagnosed metabolic condition found lower fasting blood glucose and HbA1c with berberine than in the comparison groups, without more adverse events overall. These were patients under medical care, and many were also taking prescription medicines.
• Berberine interactions, Guo and colleagues, European Journal of Clinical Pharmacology, 2012. Healthy men took 300 mg of berberine three times a day for two weeks. Berberine reduced the activity of three liver enzymes (CYP2D6, CYP2C9 and CYP3A4) that process many common medicines. The authors advise considering drug interactions whenever berberine is used.

Evidence level: small to mid-sized human trials, mostly in patients. Note the doses too. The TUDCA trials used 750 mg to 1,750 mg a day, more than either brand’s one-capsule label dose. Neither Dr. Berg’s products nor ours have been tested in trials of their own, and these results describe patients, not what a supplement will do for you. Talk to your doctor before taking berberine or TUDCA if you have a liver, gallbladder or metabolic condition, are pregnant or nursing, or take any prescription medicine.

Bundles, kits and starter stacks: reading the real price

Dr. Berg sells heavily through bundles. The store lists starter stacks for sleep, stress, digestion, energy and joints at $79.99 to $116.99, body type packages at $149.90 to $165.20, and a Complete Keto and Intermittent Fasting Kit at $324.00 against a listed $785.19. There is also a Gallbladder Formula and TUDCA Bundle at $54.88.

Bundles can be good value, but a large crossed-out price is not the same as a saving on products you would actually use. Apply the same test as the table above: list what is in the bundle, price the items you want on their own, and divide by the amount of each active you get. If you only want two of the six products in a package, the package is not a discount.

Shipping, returns and the money-back guarantee

Dr. Berg offers free standard shipping on US orders of $160 or more. Its refund policy offers a 30-day money-back guarantee on supplements, and you don’t need to send the product back. The terms are tighter than the headline, though:

• A refund applies only to your first purchase of a product, and each customer gets one refund per product.
• Buying three or more units of a product may make you ineligible for a refund.
• Food products fall under a separate policy and aren’t covered by the 30-day guarantee.
• Shipping costs are not refunded.

For comparison, Eternal Elixir offers a 30-day money-back guarantee, free US shipping on orders over $100 and dispatch within 24 hours. Buying two bottles of the same product saves 10%, three save 15% and five save 20%.

Dr. Berg review verdict: who should buy what

Buy Dr. Berg if your shopping list is everyday nutrition: electrolytes, vitamin D and K2, magnesium, zinc, digestive enzymes or gallbladder support. The prices are keen, the range is broad, and the digestion and gallbladder products go further than most brands bother to. It is also the smaller outlay if you want to try TUDCA for a month at 250 mg a day.

Buy Eternal Elixir if you want TUDCA or berberine at the lowest cost per milligram in a single-ingredient capsule, or you are building a longevity or NAD+ stack. Our TUDCA 500mg costs $1.00 per 500 mg against $1.60, and our Berberine HCl 500mg comes in 90-capsule bottles at $0.56 per 500 mg.

Dr. Berg Nutritionals is a well-priced generalist range attached to a very large keto and fasting audience. Eternal Elixir specializes in the shelf that range doesn’t stock. Many buyers will end up using both kinds of product.

Frequently asked questions about Dr. Berg

Is Dr. Berg a real doctor?

He is a Doctor of Chiropractic (DC), not a medical doctor. His biography lists a chiropractic degree from Palmer College of Chiropractic (1988) and chiropractic licenses in Virginia, California and Louisiana, and his website states that he is not a medical doctor.

Does Dr. Eric Berg still practice chiropractic?

FoodFacts.org reports that he moved away from clinical practice to focus on online education, books and his supplement line. His website says Dr. Berg and Dr. Berg Nutritionals do not diagnose or treat any medical illness or condition.

Is Dr. Berg third-party tested?

Several Dr. Berg product pages, including TUDCA and niacin, say every batch is tested and backed by a certificate of analysis confirming third-party testing for heavy metals and microbes, in a cGMP facility. The certificate itself isn’t posted on the product page, and the wording doesn’t mention a potency test, so ask for the report that matches your lot number if it matters to you.

Are Dr. Berg supplements good quality?

For everyday vitamins, minerals and electrolytes, the doses are sensible and the prices are fair. Quality is harder to judge from outside, because the testing results aren’t published on the product pages. The range is a weak fit for longevity shoppers, because it stocks none of the NAD+ precursors or other longevity actives.

What is the best TUDCA supplement, Dr. Berg or Eternal Elixir?

Our pick is Eternal Elixir TUDCA 500mg: 500 mg per capsule, 60 capsules, and $1.00 per 500 mg against $1.60 for Dr. Berg TUDCA, which has 250 mg per capsule and 30 capsules. Dr. Berg’s bottle is cheaper at checkout if you only want a one-month trial at a lower dose.

Add TUDCA 500mg to cart · $59.99

What is Dr. Berg’s refund policy?

Supplements carry a 30-day money-back guarantee without returning the product, but only on your first purchase of each product, one refund per product, and buying three or more units may disqualify you. Shipping costs aren’t refunded, and food products have a separate policy.

Does Dr. Berg sell NMN or other NAD+ supplements?

No. The Dr. Berg store has no NMN, nicotinamide riboside, resveratrol, spermidine or Ca-AKG. Its closest product is a flushing niacin (vitamin B3), which the body can use to make NAD+, at 500 mg per four-capsule serving.

Sources

1. Dr. Berg store and policies, read September 2026: TUDCA, Berberine with Ceylon Cinnamon, Niacin, refund policy, shipping policy.
2. Dr. Berg. About Dr. Berg.
3. FoodFacts.org. Dr Eric Berg, D.C.
4. Kars M, et al. Tauroursodeoxycholic acid may improve liver and muscle but not adipose tissue insulin sensitivity in obese men and women. Diabetes. 2010. PMID 20522594
5. Ma H, et al. A multicenter, randomized, double-blind trial comparing the efficacy and safety of TUDCA and UDCA in Chinese patients with primary biliary cholangitis. Medicine (Baltimore). 2016. PMID 27893675
6. Xie W, et al. Glucose-lowering effect of berberine on type 2 diabetes: a systematic review and meta-analysis. Frontiers in Pharmacology. 2022. PMID 36467075
7. Guo Y, et al. Repeated administration of berberine inhibits cytochromes P450 in humans. European Journal of Clinical Pharmacology. 2012. PMID 21870106
8. Eternal Elixir product pages: TUDCA 500mg, Berberine HCl 500mg.

More supplement brand reviews

We have costed several other large ranges the same way. The closest comparisons are our NOW Foods review, our Life Extension review, our Solaray review and our Swanson review. For the value end of the same shelf, see our Nutricost review, BulkSupplements review and NatureWise review. For brands that do sell longevity actives, read our Thorne review, Momentous review and Codeage review, or start from our ranking of the best longevity supplements. You can also browse the full Eternal Elixir range.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Dr. Berg and Dr. Berg Nutritionals are trademarks of their owners and are not affiliated with Eternal Elixir. Brand names are used only to identify the products compared.