Best of
Best Spermidine Supplement: mg per Dose and Price
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We don't sell supplements; brands can't pay for placement; rankings use published testing and price per daily dose. How we rank
Independent of the brands we list: commission never changes a ranking. How we choose: form and dose, independent testing, ingredients and price per serving.
Affiliate disclosure: some links on this page are affiliate links. If you buy through them we may earn a commission at no extra cost to you. Commission never changes how we rank products. This is general information, not medical advice.
Spermidine is a natural compound found in your cells and in many foods. In lab and animal studies it switches on a cell clean-up process and extended lifespan in yeast, worms, flies and mice, but in people the picture is much thinner. The best trial of a spermidine supplement (100 older adults, 12 months) did not improve its main memory test. We rate the evidence D. Read the spermidine guide first. This page compares the four products we have price and label data for.
Short answer: Best budget (US$): Life Extension Double Wood Spermidine 10 mg (lowest price per serving); lowest price per mg of spermidine: Toniiq Spermidine Plus 21 mg (US$); UK: spermidineLIFE Original 365+ is the only UK offer, and the higher-dose products are US or international offers only. No product has a named testing certificate in our data. Prices, testing and every shop are in the picks below.
Quick picks
| Pick | Product | Best for | Price | Buy |
|---|---|---|---|---|
| Best budget (US$) | Double Wood Spermidine 10 mg, 120 capsules | Readers paying in dollars who want the lowest price per daily serving | $0.624 per daily serving on the label ($37.46 ÷ 60 servings; checked Nov 3, 2026 at Life Extension) | Life Extension (affiliate link) +1 more |
| Lowest price per mg (US$) | Spermidine Plus, 60 capsules | Readers paying in dollars who compare by mg of spermidine | $0.832 per daily serving on the label ($24.97 ÷ 30 servings; checked Nov 3, 2026 at Toniiq) | Toniiq (affiliate link) |
| Wheat germ extract (US$) | Spermidine (wheat germ extract), 120 capsules | Readers paying in dollars who want a wheat germ extract product | $1.25 per daily serving on the label ($49.97 ÷ 40 servings; checked Nov 3, 2026 at Nutricost) | Nutricost (affiliate link) +2 more |
| UK pick (only UK offer) | spermidineLIFE Original 365+, 60 capsules | UK readers, and anyone who wants a dose closer to the trial amounts | £2.47 per daily serving on the label (£74.00 ÷ 30 servings; checked Nov 3, 2026 at spermidineLIFE) | spermidineLIFE (affiliate link) |
Our ranked picks
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Best budget (US$)
Double Wood Spermidine 10 mg, 120 capsules
Spermidine (as spermidine trihydrochloride), 10 mg per serving of 2 capsules, 120 capsules. Sold by Life Extension under the Double Wood brand.
Pros
- Lowest price per serving in dollars on this page
- Two US shops in our data
Cons
- No testing named in our data
- 10 mg is well above the 0.9 to 1.2 mg used in the memory trials we cite
- US offers only in our data
United States
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Lowest price per mg (US$)
Spermidine Plus, 60 capsules
Spermidine (trihydrochloride plus rice-germ extract), 21 mg per serving, 60 capsules.
Pros
- Lowest price per mg of spermidine on this page
Cons
- The highest dose here, 21 mg, on the thinnest evidence; do not read the dose as a recommendation
- The brand says each lot is tested but names no lab, so we do not count it
- US offers only in our data
United States
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Wheat germ extract (US$)
Spermidine (wheat germ extract), 120 capsules
Spermidine from wheat germ extract, 15 mg per serving of 3 capsules, 120 capsules.
Pros
- Wheat germ extract source
- Three shops listed (Nutricost, Amazon.com and iHerb)
Cons
- The brand says its batches are tested by independent labs, but no certificate or lab is named, so we do not count it
- 15 mg is well above the memory trial amounts
- The Amazon.com price was read through a search tool and the iHerb price is not verified
- US and international offers only in our data; wheat germ contains gluten
United States
Worldwide
- Intl Check price at iHerb
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UK pick (only UK offer)
spermidineLIFE Original 365+, 60 capsules
Spermidine-rich wheat germ extract (CelVio Complex), 2 mg of spermidine per serving of 2 capsules, plus a little vitamin B1 and zinc, 60 capsules.
Pros
- The only UK offer for spermidine in our data
- The lowest dose here, 2 mg, the closest to the 0.9 to 1.2 mg of the memory trials
Cons
- By far the highest price per mg of spermidine on this page
- The brand says it was safety-tested by a university hospital; that is a brand statement, not batch testing
- Our data does not confirm UK delivery, so check at checkout
- Wheat germ contains gluten
United Kingdom
How we rank
We only rank products that are in our product data file, and we use only what that file records:
- Form and amount. Doses are very different: 2 mg (spermidineLIFE), 10 mg (Double Wood), 15 mg (Nutricost) and 21 mg (Toniiq) of spermidine per serving, from wheat germ extract, spermidine trihydrochloride or a mix with rice-germ extract. We compare mg of spermidine itself, so each table row also shows the price per mg.
- Third-party testing, as listed. We note a named testing program (for example NSF Certified for Sport) when our data lists one. Where the data says “brand statement”, we say so and do not count it as verified by us.
- Price per daily dose. We divide the pack price by the servings per pack, then scale to our basis: one daily serving as the label defines it. Doses differ a lot (2 to 21 mg of spermidine), so we also show the price per mg of spermidine. It is a price basis, not a recommended dose. Prices in different currencies are not converted, so $ and £ are only compared within their own currency.
Winner labels. “Best overall” goes to the cheapest product with a named testing program in that currency. “Best budget” goes to the lowest price per daily dose in that currency, whatever the testing. “Best tested” is only used when one product lists clearly more named programs than the rest. If no product qualifies for a label, we leave that label out.
Region. The only UK offer in our data is spermidineLIFE. The other three products have US or international offers only. Prices in pounds and dollars are not converted.
No Best overall. None of the four lists a named third-party testing program, so we award no Best overall. Brand statements about lab testing are noted but not counted.
Unverified prices. Amazon.com prices for Nutricost and Double Wood were read through a search tool, so the table marks them and no pick relies on them.
Dose is not quality. A higher mg of spermidine is not a better product. The memory trials used 0.9 to 1.2 mg a day, and the higher doses here are not backed by those trials.
What we did not do. We have not tested these products ourselves, in a lab or by taking them. We did not rank by commission. Prices change, so each price shows the date it was checked. More in How we rank.
Price per daily dose
Basis: one daily serving as the label defines it. Doses differ a lot (2 to 21 mg of spermidine), so we also show the price per mg of spermidine. It is a price basis, not a recommended dose. Every number below is worked out from the pack price, servings per pack and amount per serving in our product data.
US dollar prices ($)
| Product (retailer) | Amount per serving | Pack price (checked) | Price per serving | Price per daily dose | Testing named in our data | Price per mg of spermidine |
|---|---|---|---|---|---|---|
| Double Wood Spermidine 10 mg, 120 capsules (Life Extension) | 2 capsules: 10 mg spermidine (as spermidine trihydrochloride) | $37.46 (Nov 3, 2026) | $37.46 ÷ 60 = $0.624 | $0.624 | None named | $0.062 ($0.624 ÷ 10 mg) |
| Double Wood Spermidine 10 mg, 120 capsules (Amazon.com) | 2 capsules: 10 mg spermidine (as spermidine trihydrochloride) | $39.95 (Nov 3, 2026; price read through a search tool, not on the shop page) | $39.95 ÷ 60 = $0.666 | $0.666 | None named | $0.067 ($0.666 ÷ 10 mg) |
| Toniiq Spermidine Plus, 60 capsules (Toniiq) | 1 serving: 21 mg active spermidine (trihydrochloride plus rice-germ extract) | $24.97 (Nov 3, 2026) | $24.97 ÷ 30 = $0.832 | $0.832 | Brand says every lot is third-party tested under its “TQ 5 Point Testing Program” with a certificate of analysis; no lab is named (brand statement) | $0.040 ($0.832 ÷ 21 mg) |
| Nutricost Spermidine (wheat germ extract), 120 capsules (Amazon.com) | 3 capsules: 15 mg spermidine (wheat germ extract) | $44.95 (Nov 3, 2026; price read through a search tool, not on the shop page) | $44.95 ÷ 40 = $1.12 | $1.12 | None named | $0.075 ($1.12 ÷ 15 mg) |
| Nutricost Spermidine (wheat germ extract), 120 capsules (Nutricost) | 3 capsules: 15 mg spermidine (wheat germ extract) | $49.97 (Nov 3, 2026) | $49.97 ÷ 40 = $1.25 | $1.25 | None named | $0.083 ($1.25 ÷ 15 mg) |
UK prices (£)
| Product (retailer) | Amount per serving | Pack price (checked) | Price per serving | Price per daily dose | Testing named in our data | Price per mg of spermidine |
|---|---|---|---|---|---|---|
| spermidineLIFE Original 365+, 60 capsules (spermidineLIFE) | 2 capsules: 1,300 mg wheat germ extract (CelVio Complex) providing 2 mg spermidine, plus 0.17 mg vitamin B1 and 1.5 mg zinc | £74.00 (Nov 3, 2026) | £74.00 ÷ 30 = £2.47 | £2.47 | Safety-tested by Charité – Universitätsmedizin Berlin (brand statement; not batch testing) | £1.23 (£2.47 ÷ 2 mg) |
Per mg, Toniiq is the cheapest ($0.040), then Double Wood ($0.062), Nutricost ($0.083) and spermidineLIFE (£1.23). Per serving, the order is different because the servings contain 2 to 21 mg.
How to start
The memory trials used 0.9 to 1.2 mg of spermidine a day, the vaccine pilot used 6 mg, and a short safety study used 40 mg a day for up to 28 days. Those are study amounts, not recommendations, and the longest trial lasted 12 months. The products here range from 2 to 21 mg per serving. See the spermidine guide.
Talk to your doctor or pharmacist
Talk to your doctor or pharmacist before you start any supplement, especially if you are pregnant or breastfeeding, take prescription medicine, or have a health condition. This matters especially if you take regular medicine, because we found no human studies testing spermidine alongside medicines, or if you have a history of cancer. The full guide has the evidence, safety notes and citations.
How we chose
We compared four spermidine products by mg of spermidine per serving, source, named testing and price per daily serving on the label. We have not tested any product ourselves, and commission does not affect the order.
FAQ
What is the best spermidine supplement?
From our data: Life Extension’s Double Wood has the lowest price per serving in dollars, Toniiq has the lowest price per mg, and spermidineLIFE is the only UK offer. None lists a named testing certificate, and higher mg is not better evidence.
What spermidine dose do studies use?
The memory trials used 0.9 to 1.2 mg of spermidine a day. These are study amounts, not recommendations. See the guide.
Does spermidine work?
The best supplement trial did not improve its main memory test over 12 months, and we found no human trial of living longer.
Why do the products have such different doses?
Brands choose their own amounts: 2 mg, 10 mg, 15 mg and 21 mg per serving here. The memory trials used 0.9 to 1.2 mg, so the higher doses go beyond the amounts we cite.
This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Medical disclaimer