Best Spermidine Supplements in Australia 2026: 8 Products Compared

Last updated: September 27, 2026 · Originally published: April 11, 2026 · By Eternal Elixir Editorial

Quick answer: The best spermidine supplement for most Australians is Eternal Elixir Spermidine 10mg. Each capsule holds 10mg of spermidine, listed on the label as spermidine trihydrochloride, and a bottle of 90 capsules costs $49.99, which is $0.56 a day at one capsule. It ships from Sydney within 24 hours. If the lowest cost per milligram is all you care about, Neurogan Health’s 10mg tablets on iHerb cost less per milligram. If you want a whole-food wheat germ extract, the kind of ingredient used in the published memory trials, Primeadine is the one to look at, at a much higher price per milligram.

Eternal Elixir makes Spermidine 10mg, and it is our pick, so read this as our recommendation rather than a neutral review. The other seven products are spermidine supplements you can order in Australia today. We took every price, dose and direction from the seller’s own page in September 2026. We did not lab-test any of them, including our own, so the figures below are what each label says.

Spermidine supplements in Australia at a glance

• Doses vary tenfold. Listings sold to Australians run from 1mg to 10mg of spermidine per capsule, and cost per labelled milligram runs from $0.029 (Neurogan Health) to $5.00 (Primeadine).
• The biggest human trial was small in dose. The SmartAge trial gave 100 older adults 0.9mg of spermidine a day from wheat germ, or a placebo, for 12 months. Its main memory measure did not change (Schwarz 2022).
• “10mg” on the label may not mean 10mg of spermidine. Spermidine is about 57% of spermidine trihydrochloride by weight, so 10mg of the salt holds about 5.7mg of spermidine.
• Pharmacies rarely stock it. Chemist Warehouse’s site search returned no spermidine supplement when it was checked in September 2026. Most Australians buy spermidine online.
• Bottle sizes differ. A bottle lasts anywhere from 30 days (Primeadine, California Gold Nutrition’s smallest size) to 120 days (Neurogan Health, Zenement). Ours lasts 90 days at one capsule a day.

Spermidine supplements compared (as of Sep 2026)

Cost per day uses the serve printed on each label. Cost per labelled milligram is the price divided by the total spermidine the label claims for the bottle, so every row is worked out the same way. “Labelled” matters here: most sellers don’t say whether their figure is spermidine itself or the heavier trihydrochloride salt, which we explain further down.

Two things stand out. Neurogan Health is the cheapest per milligram by a clear margin, and we rank it second for that reason. Our Spermidine 10mg comes next at $0.056 per labelled milligram, just ahead of Zenement at $0.059, and it is the only product in the table that combines a 10mg capsule, a 90-day bottle and dispatch from Sydney. The wheat germ products (Primeadine, Zenement) and the rice germ product (California Gold Nutrition) are a different kind of supplement: a food extract with other polyamines in it, not an isolated spermidine salt. If you are new to reading supplement labels, our guide to what to check on an Australian supplement label covers the gaps that make a table like this necessary.

Add Spermidine 10mg to cart · $49.99

1. Eternal Elixir Spermidine 10mg: our pick for Australian buyers

Eternal Elixir Spermidine 10mg is a plain spermidine capsule. The ingredient panel lists spermidine (as spermidine trihydrochloride) at 10mg per capsule, rice flour and a cellulose capsule, with 90 capsules per bottle. The label says to take one capsule a day with a meal, so a bottle lasts three months.

It is $49.99 a bottle, down from $59.99, which is $0.56 a day. Two bottles save 10%, three save 15% and five save 20%, and orders over $100 ship free. Orders leave Sydney within 24 hours, which matters if you have compared delivery times from overseas stores that quote one to two weeks. It comes with a 30-day money-back guarantee, and Afterpay is available at checkout.

Who it suits: Australians who want a 10mg daily capsule with the salt form written on the label, three months to a bottle and a local delivery time.

Who it doesn’t suit: anyone set on a whole-food wheat germ extract, because this is an isolated compound and doesn’t carry the spermine and putrescine a wheat germ extract contains. It also isn’t the cheapest per milligram. Neurogan Health is. And no published trial has tested 10mg a day of spermidine against a health outcome over months, which is true of every capsule in this list.

If you want to see the batch certificate of analysis before you buy, the product page says you can request the current one and it will be emailed to you.

2. Neurogan Health Spermidine 10mg (iHerb AU): lowest cost per milligram

Neurogan Health Spermidine is sold to Australians through iHerb at AU$34.67 for 120 tablets. Each tablet lists 10mg of spermidine as spermidine 3HCl (trihydrochloride), and the direction is one tablet a day. The listing says it is manufactured in the USA using foreign and domestic materials.

At $0.029 per labelled milligram it costs about half what ours does per milligram, and a bottle lasts four months. iHerb also lists Probase Nutrition Spermidine at AU$34.05 for 120 capsules of 10mg spermidine trihydrochloride, which is almost the same deal.

Who it suits: buyers who want the lowest price per milligram and are happy ordering through iHerb.

Who it doesn’t suit: anyone who wants a local seller to deal with directly, or who wants to order from the brand rather than a marketplace. Like every isolated product here, it has no outcome trial behind the 10mg dose.

3. Primeadine Original (OptimOZ): the whole-food wheat germ option

Primeadine, from Oxford Healthspan, is sold in Australia by OptimOZ at $149.95. The Original version is a concentrated wheat germ extract standardised to 1mg of spermidine per three-capsule serve, with 90 capsules (30 serves) in a bottle. A three-bottle pack is $419.85. The directions say to build up over three days, one capsule on day one, two on day two and three from day three, and to drop back a capsule if you get digestive discomfort. OptimOZ’s listing says every batch is tested for spermidine content.

There is also Primeadine GF, a gluten-free whole-food blend (chlorella, shikuwasa citrus peel and turmeric) made in Okinawa, Japan, with 1.2mg of spermidine per four-capsule serve, at the same $149.95 price. The Original is made in the USA or Europe and contains wheat, so it is not suitable if you avoid gluten.

The cost per milligram, $5.00, is by far the highest in the table. What you pay for is the form. The two published memory trials in older adults used a spermidine-rich wheat germ extract at about 1mg a day, which is closer to Primeadine than to any 10mg salt capsule.

Who it suits: buyers who specifically want a food-derived polyamine blend at the dose range the human trials used.

Who it doesn’t suit: anyone on a budget, anyone avoiding wheat (unless they choose the GF version), and anyone who doesn’t want to take three or four capsules a day.

4. The Protein Factory Spermidine: made in Victoria

The Protein Factory sells its own spermidine at $50.00 for 60 capsules, listed as 10mg of spermidine per serve with 60 serves. The ingredients are spermidine, Rhaponticum carthamoides (maral root) and cellulose. Its older product page says it is made in Ferntree Gully, Victoria, by its manufacturing arm, Biodome Functional Foods, and the new shop page shows it in stock.

Shipping anywhere in Australia is $9.50 for orders under 500g, and the shop says most standard orders arrive within 2 to 5 days.

Who it suits: buyers who want a product made in Australia and are fine with a 60-day bottle.

Who it doesn’t suit: anyone who wants to know the salt form (the listing doesn’t say) or who doesn’t want a second herb in the capsule. The page doesn’t give a separate amount for the Rhaponticum.

If local manufacture is your deciding factor, our roundup of Australian supplement brands by specialty is worth a read too.

5. Zenement Spermidine + B1 + Zinc (Naturitas): low daily cost with added nutrients

Zenement’s spermidine is listed on Naturitas at $42.16 for 120 capsules, or $40.90 each when you buy three. The listing says each capsule provides 6mg of spermidine from wheat germ extract, with vitamin B1 and zinc added, and to take one capsule a day with a meal.

At $0.35 a day it is one of the cheapest daily serves here, and its cost per milligram ($0.059) is close to ours. Naturitas is a cross-border store based in Barcelona, and the product page says it can’t confirm a delivery date, so plan for an overseas order.

Who it suits: buyers who want a wheat germ-based product at a low daily cost and don’t mind waiting on an international delivery.

Who it doesn’t suit: anyone who wants spermidine on its own, anyone avoiding gluten (it comes from wheat germ, so check the label), and anyone who needs it quickly.

6. Naturecan Spermidine: a 5mg starter dose

Naturecan’s Australian store sells spermidine capsules at $40.00 for 60, $72.00 for 120 and $100.00 for 180. Each capsule holds 5mg of spermidine, the direction is one capsule a day, and the capsules are vegan and made in the UK. The product page links to a certificate of analysis.

Orders ship from Naturecan’s UK warehouse, with 7 to 14 business days in transit. Shipping is A$19.99 on orders under A$99, A$9.99 over A$99 and free over A$179.

Who it suits: first-time buyers who want a lower daily dose and a published certificate.

Who it doesn’t suit: anyone who wants 10mg a day (you would need two capsules, which doubles the daily cost) or fast delivery.

7. DoNotAge Pure Spermidine: a single-ingredient 8mg capsule

DoNotAge sells Pure Spermidine through an Australian-dollar storefront at $63.00 for 60 capsules. Each capsule contains 8mg of spermidine, and the recommended daily serving is 8mg, so one capsule a day. The brand says the capsule holds only spermidine and a plant cellulose shell, that the product is free from gluten and soy, and that certificates of analysis are available on request.

Its shipping FAQ quotes 3 to 7 working days for countries outside the UK, US and EU, which includes Australia.

Who it suits: buyers who want a single-ingredient capsule with nothing else in it.

Who it doesn’t suit: anyone watching cost. At $1.05 a day it is the second most expensive daily serve in the table.

8. California Gold Nutrition Spermidine (iHerb AU): lowest outright price

California Gold Nutrition’s spermidine is $15.70 for 30 capsules on iHerb Australia, or $37.47 for 90. Each capsule gives 1mg of spermidine from 100mg of rice germ extract, taken once a day with or without food. The listing says it is formulated without gluten and not manufactured with wheat.

Who it suits: anyone who wants to try spermidine for the smallest outlay, or who wants a food-derived source without wheat.

Who it doesn’t suit: anyone after a higher dose. At 1mg a capsule, reaching 10mg a day would take ten capsules.

What the human trials found about spermidine

Spermidine is a polyamine that every living cell makes, and it is also in food. Most of the interest comes from animal work. In a 2009 paper in Nature Cell Biology, spermidine extended the lifespan of yeast, flies and worms, and of human immune cells grown in the lab, and it switched on autophagy, the process cells use to break down and recycle worn-out parts (Eisenberg 2009). In 2016, oral spermidine extended the lifespan of mice and improved heart function in old mice (Eisenberg 2016). Mice and worms are not people, and none of these results tells you what a capsule will do for you.

The human evidence is thinner, and it is mixed:

• Diet studies. In the Bruneck study in northern Italy, 829 adults aged 45 to 84 filled in food questionnaires from 1995 to 2010. People who ate the most spermidine had lower death rates over 20 years of follow-up (Kiechl 2018). This is an observational study. People who eat more wheat germ, cheese, mushrooms and legumes may differ in other ways, so it can’t show that spermidine caused the difference.
• A small pilot. In 2018, 30 adults aged 60 to 80 who felt their memory was slipping took a spermidine-rich plant extract or a placebo for three months. The spermidine group did moderately better on a memory task (Wirth 2018). A companion paper reported no differences in safety bloods, weight or vital signs at 1.2mg a day (Schwarz 2018).
• The larger trial. The same group then ran SmartAge: 100 adults aged 60 to 90 took six capsules a day of a wheat germ extract (750mg, giving about 0.9mg of spermidine), or a placebo, for 12 months. Memory did not change compared with placebo (P = .47), and neither did the secondary measures. The authors reported possible effects on verbal memory and some inflammation markers in exploratory analyses and called for trials at higher doses (Schwarz 2022). The extract came from The Longevity Labs, in which several authors reported equity interests.
• Absorption. In a crossover study, 12 healthy adults took 15mg of spermidine a day for five days. Blood spermine rose, but blood spermidine did not. The authors concluded that doses below 15mg a day are unlikely to have short-term effects (Senekowitsch 2023).
• A high-dose safety trial. 37 men aged 50 to 70 took 40mg a day of high-purity spermidine trihydrochloride for 28 days. There were no significant changes in safety bloods and no product-related adverse events, and blood and urine polyamine levels changed little (Keohane 2024). Two of the authors work for Chrysea Labs, and the others received funding from it.

Put together: spermidine looks safe at the doses tested, the mechanism is well studied in animals, and the one year-long human trial found no main effect at a low dose. The 5 to 10mg capsules sold in Australia have not been tested against a health outcome in a trial of that size. Buy on a clear label and a fair price, and keep your expectations in line with the evidence. For a deeper look at what the studies measured, see our guide to spermidine benefits and the research behind them, and our longevity supplement evidence index for how spermidine compares with other ingredients.

Add Spermidine 10mg to cart · $49.99

The label maths: why “10mg” may not be 10mg of spermidine

Isolated spermidine is usually sold as spermidine trihydrochloride, a salt that is more stable than spermidine on its own. Spermidine has a molecular weight of 145.25, and the trihydrochloride salt 254.6 (PubChem), so spermidine makes up about 57% of the salt by weight. If a label’s “10mg” is the weight of the salt, the capsule holds about 5.7mg of spermidine.

Labels are written in two ways. “Spermidine trihydrochloride 10mg” gives the weight of the salt. “Spermidine (as spermidine trihydrochloride) 10mg” is the usual way to state the spermidine itself, supplied in salt form. Our label uses the second wording. Sellers are not always consistent, though, so if the difference matters to you, ask for the certificate of analysis. Several listings in our table state neither.

Wheat germ and rice germ extracts avoid the question because they state the spermidine content of the extract directly: 1mg per three capsules for Primeadine, 1mg from 100mg of rice germ extract for California Gold Nutrition. Those numbers are small, and they are clear.

Spermidine powder or capsules?

Capsules suit most buyers. The dose is fixed, there is nothing to weigh, and spermidine tastes unpleasant, which a capsule hides. Every product in our table is a capsule or tablet, although Primeadine’s capsules can be opened into a cold drink.

Powder gives you a flexible dose and can be cheaper in bulk, but you are measuring single milligrams, and a kitchen scale can’t weigh that accurately. For a first spermidine supplement, capsules are the sensible default. We set out the full trade-off in spermidine powder vs capsules.

Spermidine side effects and who should check with a doctor first

In the trials above, spermidine was well tolerated. SmartAge reported adverse events balanced between the spermidine and placebo groups over 12 months, and the 40mg-a-day study reported no product-related adverse events over 28 days. Primeadine’s directions mention digestive discomfort and suggest building up over three days.

• Wheat germ products such as Primeadine Original and Zenement contain gluten. Choose an isolated capsule or a rice germ product if you avoid wheat.
• Talk to your doctor or pharmacist before you start if you are pregnant or breastfeeding, take prescription medicines or have a medical condition.
• Spermidine supplements are for adults. Keep them away from children.
• Start one new supplement at a time, so you can tell what caused any change.

How to choose a spermidine supplement in Australia

1. Check the milligrams per capsule and the form. Look for the words “as spermidine trihydrochloride” or a stated extract amount. A listing that gives neither leaves you guessing.
2. Work out the cost per milligram. Divide the price by the capsules times the milligrams per capsule. Bottle prices alone hide a tenfold spread.
3. Count the days per bottle. A 30-day bottle at a low price can cost more over a year than a 90-day bottle.
4. Look at where it ships from. Delivery from the overseas stores in our table takes one to two weeks or has no set date, while domestic sellers deliver in days.
5. Read the other ingredients. Some products add zinc, vitamin B1, herbs or wheat germ. That is fine if you want them and a waste if you don’t.

Spermidine with NMN, resveratrol and other longevity supplements

Spermidine is often taken alongside NAD+ precursors such as NMN, because the two are studied for different reasons: spermidine for autophagy, NMN for NAD+ levels. We compare them in spermidine vs NMN, and cover the wider group in our best autophagy supplements in Australia comparison. If you are putting a routine together, building a longevity stack with NMN, resveratrol, spermidine and TUDCA walks through the order, and the longevity stack comparison sets out what each tier costs.

If you would rather buy them together, our Cellular Longevity Stack combines NMN, spermidine and pterostilbene. It already contains spermidine, so don’t add a separate spermidine bottle on top unless you mean to take two doses. For single products, see NMN 500mg and our comparisons of the best NMN supplements in Australia, NAD+ supplements and resveratrol supplements.

How we compared these spermidine supplements

We looked at eight spermidine products that Australians can order today, from Australian and overseas sellers. For each we recorded, from the seller’s own page in September 2026: the price in AUD, capsules per bottle, spermidine per capsule and how the label states it, the label serve, delivery terms where the seller publishes them, and any added ingredients. We then worked out cost per day and cost per labelled milligram in the same way for every row.

We did not test competitor products, and we don’t claim testing for any product beyond what its seller states. Ours is ranked first, and we have said why: a 10mg capsule with the salt form on the label, 90 capsules, dispatch from Sydney within 24 hours and the second-lowest cost per milligram in the table. Each other product keeps the label it earns on its own facts, such as lowest cost per milligram, whole-food form or Australian manufacture. Prices change, so check the seller’s page before you buy.

Verdict: which spermidine supplement should you buy?

• Most Australians: Eternal Elixir Spermidine 10mg. $49.99 for 90 capsules, $0.56 a day, 10mg per capsule as spermidine trihydrochloride, dispatched from Sydney.
• Lowest cost per milligram: Neurogan Health Spermidine 10mg on iHerb, at $0.029 per labelled milligram.
• Whole-food wheat germ: Primeadine Original from OptimOZ, if you accept $5.00 a day, or Primeadine GF if you avoid gluten.
• Made in Australia: The Protein Factory Spermidine, made in Victoria.
• Low daily cost with added nutrients: Zenement via Naturitas, if an overseas order suits you.
• A lower starting dose: Naturecan at 5mg a capsule, or California Gold Nutrition at 1mg for the smallest outlay.

Spermidine has a strong animal evidence base and thin human outcome data. That is a reason to buy on a clear label and a fair price rather than on promises. For where it sits among other ingredients, see our best longevity supplements in Australia comparison.

Related reading

• Spermidine and winter: the autophagy connection
• What the research shows about spermidine
• All our supplement buying guides
• The Eternal Elixir blog
• Shop the full Eternal Elixir range

Frequently asked questions about spermidine in Australia

What is the best spermidine supplement in Australia?

Our pick is Eternal Elixir Spermidine 10mg: 10mg of spermidine per capsule as spermidine trihydrochloride, 90 capsules for $49.99 ($0.56 a day), shipped from Sydney within 24 hours. We make it, so weigh that. Neurogan Health’s 10mg tablets on iHerb cost less per milligram, and Primeadine is the choice if you want a whole-food wheat germ extract.

Add Spermidine 10mg to cart · $49.99

Where can I buy spermidine in Australia?

Mostly online. You can buy it from Australian sellers such as Eternal Elixir and The Protein Factory, from OptimOZ (Primeadine), from iHerb’s Australian site, and from overseas stores with Australian-dollar pricing such as Naturecan, Naturitas and DoNotAge. Overseas stores in our table quote 3 to 14 business days in transit, or no set date.

Is spermidine sold at Chemist Warehouse or Chemist Discount Centre?

When Chemist Warehouse’s site search was checked in September 2026, “spermidine” returned no spermidine supplement, only a skincare product. Pharmacy ranges change, so check Chemist Warehouse’s or Chemist Discount Centre’s own site before you visit a store. For now, most Australians buy spermidine from specialist sellers online.

What are spermidine supplements used for?

People take spermidine to support healthy ageing and normal cellular renewal. Spermidine switches on autophagy in cells and animals, and higher dietary intake was linked with lower death rates in one long observational study. The trials in people so far have been small or have found no main effect, so treat it as a promising ingredient with limited human evidence.

Is it worth taking spermidine supplements?

It depends on what you expect. The animal research is strong, the human evidence is limited, and the one 12-month trial found no change in memory at 0.9mg a day. If you want to include spermidine in a longevity routine, choose a product with a clear label and a fair cost per milligram, and treat it as a long-term habit rather than a quick fix.

What are the negative effects of spermidine?

Trials have reported spermidine as well tolerated, with adverse events similar to placebo over 12 months and no product-related adverse events at 40mg a day over 28 days. Some people notice mild digestive discomfort, which is why Primeadine suggests building up over three days. Wheat germ products contain gluten. Talk to your doctor first if you are pregnant, breastfeeding or take prescription medicines.

How much spermidine should I take per day?

There is no established dose. Australian products range from 1mg to 10mg a day, and most labels say one capsule a day. The year-long human trial used 0.9mg a day, and a short absorption study suggests doses under 15mg a day are unlikely to have short-term effects. Follow your product’s label and don’t exceed it.

Does a 10mg capsule really contain 10mg of spermidine?

It depends on how the label is written. Spermidine is about 57% of spermidine trihydrochloride by weight, so if the 10mg is the salt weight, you get about 5.7mg of spermidine. A label that reads “spermidine (as spermidine trihydrochloride) 10mg” normally refers to the spermidine itself. When a label gives no form at all, ask the seller.

Which food is highest in spermidine?

Wheat germ is one of the richest food sources, which is why most whole-food spermidine supplements are wheat germ extracts. Aged cheese, mushrooms, soy products and legumes such as green peas also contain it.

Can I take spermidine with NMN or resveratrol?

Yes, they are often taken together, and we know of no interaction between them. Add one at a time so you can tell what is working, and check with your doctor if you take prescription medicines. Our Cellular Longevity Stack already combines NMN and spermidine with pterostilbene, so don’t add a separate spermidine bottle to it unless you intend to double the dose.

Sources

• Eisenberg T, Knauer H, Schauer A, et al. Induction of autophagy by spermidine promotes longevity. Nat Cell Biol. 2009;11(11):1305-1314. PubMed 19801973
• Eisenberg T, Abdellatif M, Schroeder S, et al. Cardioprotection and lifespan extension by the natural polyamine spermidine. Nat Med. 2016;22(12):1428-1438. PubMed 27841876
• Kiechl S, Pechlaner R, Willeit P, et al. Higher spermidine intake is linked to lower mortality: a prospective population-based study. Am J Clin Nutr. 2018;108(2):371-380. PubMed 29955838
• Wirth M, Benson G, Schwarz C, et al. The effect of spermidine on memory performance in older adults at risk for dementia: a randomized controlled trial. Cortex. 2018;109:181-188. PubMed 30388439
• Schwarz C, Stekovic S, Wirth M, et al. Safety and tolerability of spermidine supplementation in mice and older adults with subjective cognitive decline. Aging (Albany NY). 2018;10(1):19-33. PubMed 29315079
• Schwarz C, Benson GS, Horn N, et al. Effects of spermidine supplementation on cognition and biomarkers in older adults with subjective cognitive decline: a randomized clinical trial. JAMA Netw Open. 2022;5(5):e2213875. PubMed 35616942
• Senekowitsch S, Wietkamp E, Grimm M, et al. High-dose spermidine supplementation does not increase spermidine levels in blood plasma and saliva of healthy adults: a randomized placebo-controlled pharmacokinetic and metabolomic study. Nutrients. 2023;15(8):1852. PubMed 37111071
• Keohane P, Everett JR, Pereira R, et al. Supplementation of spermidine at 40 mg/day has minimal effects on circulating polyamines: an exploratory double-blind randomized controlled trial in older men. Nutr Res. 2024;132:1-14. PubMed 39405978
• PubChem: spermidine (CID 1102) and spermidine trihydrochloride (CID 9539), molecular weights.
• Product pages for Neurogan Health, Probase Nutrition and California Gold Nutrition (iHerb AU), Primeadine (OptimOZ), The Protein Factory, Zenement (Naturitas), Naturecan and DoNotAge, checked September 2026 and linked in the table above. Eternal Elixir figures are from our own product page and label.