Adenosine

CAS Number	58-61-7 (verified against PubChem CID 60961)
Molecular Formula / MW	C10H13N5O4 / 267.24 g/mol
Chemical Class	Purine nucleoside — adenine linked to D-ribose; an endogenous human metabolite, not a phytochemical
Fungal Source	Cordyceps militaris; also Ophiocordyceps sinensis
Part(s)	Fruiting body and mycelium
Typical Standardisation	Adenosine by HPLC; 0.2% commercial grade. Cordycepin is a separate marker
Claim Strength (Overview)	High as a quality/identity marker; Emerging as a bioactive in its own right in oral Cordyceps
Buy from Herbuno	Adenosine 0.2% Powder (Cordyceps Extract) | Standardized Cordyceps militaris → Cordycepin 2% Powder (Cordyceps Extract) | Standardized Cordyceps militaris →

Name origin: Adenosine is named for adenine, the purine base it carries, joined to a ribose sugar. It is one of the most fundamental molecules in biology — the "A" of ATP, ADP, cAMP, and of RNA itself — and it is emphatically not a phytochemical or a fungal secondary metabolite. It is an endogenous human metabolite present in every cell you have. That fact is the key to reading this page correctly. Traditional use: There is none for adenosine as such. Cordyceps has a long record in Chinese and Tibetan medicine — the wild caterpillar fungus Ophiocordyceps sinensis being one of the most expensive medicinal materials in the world, used for fatigue, respiratory complaints, and vitality — but no traditional system identified adenosine, which was characterised by 20th-century biochemistry. Research trajectory: Adenosine entered Cordyceps commerce primarily as a quality marker. Chinese pharmacopoeial and industry practice adopted adenosine as an HPLC-quantifiable identity and consistency standard for Cordyceps preparations, because it is present, stable, and easy to assay. Whether it is a meaningful driver of the herb’s effects when taken orally is a separate and much less settled question, and this page keeps the two apart. Commercial source: Cordyceps militaris extract standardized to adenosine content; note that adenosine and cordycepin are separate markers standardised independently.

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Evidence for Adenosine Applications

Adenosine’s primary commercial function in this context is as a marker, and that should be stated before any bioactivity claim. Cordyceps militaris contains polysaccharides (galactomannan), the nucleotides adenosine and cordycepin, cordycepic acid, amino acids, and sterols; a randomized controlled clinical trial of a C. militaris beverage in healthy adults noted that in prior work, volunteers received C. militaris capsules specified by four separate figures — 32% cordyceps polysaccharide, 7.3% cordycepic acid, 0.13% adenosine, and 0.001% cordycepin (Sci Rep 2024). Note the striking asymmetry: adenosine at 0.13% and cordycepin at 0.001% — a hundredfold difference in a supposedly cordycepin-driven product. This tells you a great deal about how these specifications actually work. Claim strength: Moderate.

Analytical methods for adenosine in Cordyceps are well developed, which is precisely what makes it useful as a quality marker rather than as an active. Near-infrared spectroscopy has been applied to determine adenosine and cordycepin concentrations in C. militaris fruiting bodies, building on prior reflectance work achieving strong prediction of adenosine and polysaccharide contents in mycelium powder (ACS Omega 2020). A compound is chosen as a pharmacopoeial marker for its assayability and stability, not for proven efficacy — the two criteria are entirely different, and conflating them is a common error in this trade. Claim strength: High (analytical).

The honest position on adenosine as an oral bioactive is sceptical, and formulators deserve to hear it. Adenosine is an endogenous metabolite with an extremely short plasma half-life — on the order of seconds — because it is rapidly taken up by cells and deaminated by adenosine deaminase. This is why intravenous adenosine is used clinically as a rapid-acting antiarrhythmic that terminates supraventricular tachycardia and then vanishes. The idea that a 0.2% oral extract meaningfully raises systemic adenosine signalling, against a background of ubiquitous endogenous production and rapid enzymatic clearance, is not a proposition the pharmacology readily supports. Claim strength: Emerging (and mechanistically doubtful for oral use).

Adenosine receptor signalling is nonetheless invoked mechanistically in the Cordyceps literature, and the reason is worth understanding. Cordycepin is 3′-deoxyadenosine — structurally an adenosine analogue — and effects attributed to Cordyceps extracts have been described as achieved through interactions involving adenosine receptors, AMPK, and ATP signalling. The mechanism runs through the analogue, not through supplemental adenosine itself. Anyone marketing an adenosine-standardized product on adenosine-receptor grounds should be clear that they are borrowing cordycepin’s mechanism. Claim strength: Emerging (animal models).

The compound also has a pharmaceutical life entirely separate from this context, and it is instructive. Adenosine administered intravenously causes transient heart block at the AV node and is classified as a class V antiarrhythmic; it is also a potent vasodilator and a neurotransmitter. That a molecule with this pharmacological potency is used at 0.2% as a botanical quality marker, with no expectation of systemic effect, is itself a useful illustration of why route, dose, and pharmacokinetics matter more than the presence or absence of a compound name on a certificate. Claim strength: High (established pharmacology, parenteral route).

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Dosage & Formulator Specification

Herbuno carries Cordyceps militaris extract standardized to 0.2% adenosine, alongside cordycepin-standardized grades (2% and 1%), Cordyceps sinensis polysaccharide grades (40% and 30%), and dried Cordyceps militaris mushroom. Buyers should treat adenosine as an identity and consistency marker and should specify cordycepin or polysaccharide separately where the claim rests on those fractions.

No meaningful oral dose-response relationship has been established for adenosine as a supplement ingredient, and a formulator should not present one. Cordyceps clinical work has used whole extract at doses such as 1.5 g/day, with the adenosine content being an incidental specification rather than the dosed variable. Given adenosine’s seconds-long plasma half-life, rapid cellular uptake, and deamination by adenosine deaminase, dose escalation of an adenosine-standardized extract on the assumption of proportional systemic adenosine effect is not supportable. Dose against the fraction the claim actually rests on.

Analytical verification should specify adenosine by HPLC and, critically, should specify cordycepin separately — the two are independently standardised and, as the trial-material specification above illustrates, can differ by two orders of magnitude within the same product. Source species must be documented: Cordyceps militaris is cultivated and cordycepin-rich, while Ophiocordyceps sinensis is the wild caterpillar fungus and is a different, far more expensive, and frequently adulterated material. Fruiting body versus mycelium-on-grain origin is a further material distinction, discussed at length on the Polysaccharides page in this index.

Cordyceps militaris is a cultivated edible fungus with a good safety record and no significant toxicity signal at supplement intakes; adenosine at 0.2% presents no plausible systemic risk given endogenous production and rapid clearance. Two cautions are worth noting for the whole extract rather than the marker. Cordyceps has documented immunostimulatory activity, including increased NK cell activity in controlled trials, so caution is appropriate for individuals with autoimmune conditions or on immunosuppressive therapy. Separately, the antiplatelet activity reported for some Cordyceps preparations warrants caution alongside anticoagulants. Adulteration of premium O. sinensis material is well documented and is a commercial rather than a safety concern.

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Frequently Asked Questions — Adenosine

Is adenosine actually a bioactive in Cordyceps, or just a marker?
Primarily a marker, and formulators deserve that stated plainly. It was adopted as an HPLC-quantifiable identity and consistency standard because it is present, stable, and easy to assay — criteria entirely different from proven efficacy. Adenosine has a plasma half-life of seconds and is rapidly deaminated, so a 0.2% oral extract meaningfully raising systemic adenosine signalling is not well supported.

Is adenosine the same as cordycepin?
No, though they are closely related — cordycepin is 3′-deoxyadenosine, an adenosine analogue. They are standardised independently and can differ by two orders of magnitude in the same product: one trial material specified 0.13% adenosine and 0.001% cordycepin. Specify whichever fraction your claim actually rests on.

Why is adenosine used as the marker if cordycepin is the active?
Because pharmacopoeial markers are selected for assayability, stability, and abundance — not for proven efficacy. This is a common and under-stated situation in botanical standardisation. It is a useful illustration of why a compound name on a certificate tells you less than route, dose, and pharmacokinetics do.

Is Cordyceps militaris the same as the wild caterpillar fungus?
No. Cordyceps militaris is cultivated and cordycepin-rich. Ophiocordyceps sinensis is the wild caterpillar fungus — a different, far more expensive, and well-documented adulteration target. Source species must be documented on the specification, as must fruiting body versus mycelium-on-grain origin.

Related compounds: Polysaccharides, Beta-Glucans, Lentinan, Alpha-Lipoic Acid

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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