Helium is the second most abundant element in the observable universe, making up roughly a quarter of all ordinary matter by mass, yet on Earth it is genuinely scarce and increasingly difficult to secure. The paradox exists because helium is too light for our planet’s gravity to hold onto permanently. Nearly all the helium we actually use comes not from the air but from underground, where it accumulates over millions of years as a byproduct of radioactive decay, trapped alongside natural gas in the same geological formations that hold fossil fuels. That origin story, and the mismatch between cosmic plenty and terrestrial scarcity, explains why helium periodically lands on critical-resource lists and why its supply chain is more fragile than most people realize.
Cosmic Abundance and the Big Bang
Almost all of the helium in the universe was forged in the first few minutes after the Big Bang. During that brief window, temperatures and densities were high enough for protons and neutrons to fuse into helium-4 nuclei. Measurements of low-metallicity regions in distant galaxies put the primordial helium mass fraction at about 0.2565, meaning roughly a quarter of all baryonic matter that emerged from the Big Bang was helium rather than hydrogen.1The Astrophysical Journal Letters. THE PRIMORDIAL ABUNDANCE OF 4He: EVIDENCE FOR NON-STANDARD BIG BANG NUCLEOSYNTHESIS Stars have been adding to that stockpile ever since. The Sun, for instance, generates about 99 percent of its power by fusing hydrogen into helium in its core.2Nature. Neutrinos from the primary proton–proton fusion process in the Sun Every star in the sky is doing something similar, steadily converting hydrogen to helium and heavier elements over its lifetime.
So on a universal scale, helium is anything but rare. It fills nebulae, giant planets, and the interstellar medium. The problem is that none of that cosmic helium does us much practical good. We cannot harvest it from the Sun or from Jupiter. For human purposes, the only helium that matters is the small amount that exists here on Earth, and that supply has a very different origin.
How Earth Makes Its Own Helium
Earth’s helium is not left over from the planet’s formation. Most of the primordial helium that was present when the solar system coalesced escaped into space long ago because our planet’s gravity is too weak to permanently retain such a light gas. The helium we extract today is instead a product of radioactive decay happening deep in the crust. Uranium and thorium, scattered through granitic basement rocks, undergo alpha decay over billions of years. Each alpha particle is a helium-4 nucleus, and once it picks up two electrons, it becomes a helium atom. Studies of helium-producing granites show that the bulk of this production is concentrated in uranium- and thorium-bearing minerals like uraninite and monazite, with roughly 95 percent of the uranium and up to 91 percent of the thorium residing in those specific minerals.3Chemical Geology. The role of element distribution in production and release of radiogenic helium: the Carnmenellis Granite, southwest England
This production is slow and constant. Uranium-238 has a half-life of about 4.5 billion years, and thorium-232’s is even longer at about 14 billion years. The helium generated from their decay accumulates atom by atom over geological time. Some of it stays locked in the mineral grains for a while, but eventually it migrates upward through fractures and pore spaces in the rock. If nothing traps it along the way, it reaches the atmosphere and promptly drifts into space. If it encounters the right kind of geological seal, it can collect in commercially useful concentrations.
Why Earth Keeps Losing Its Helium
Helium atoms are light enough and fast enough at upper-atmosphere temperatures to reach escape velocity. The process is relentless. Modeling of helium escape from the upper atmosphere shows that thermal escape proceeds at roughly 97 to 99 percent of the theoretical maximum rate.4Planetary and Space Science. Departures from jeans’ escape rate for H and He in the earth’s atmosphere On top of that thermal leakage, helium ions in the upper atmosphere can be swept away along open magnetic field lines in a process called polar wind. Calculations of that ion outflow suggest the combined escape is roughly in balance with the rate at which new helium seeps out of the crust, so atmospheric helium stays at a nearly constant but tiny concentration, about five parts per million.5Journal of Geophysical Research: Space Physics. Helium escape from the terrestrial atmosphere: The ion outflow mechanism
Five parts per million is far too dilute to extract economically. That is why we do not simply pull helium from the air the way we pull nitrogen and oxygen in industrial gas-separation plants. Air-separation plants could, in principle, capture helium, but the energy cost of concentrating something present at five parts per million from the enormous volume of air required would be prohibitive. Instead, we rely on the geological accidents that concentrate helium underground to levels thousands of times higher than what the atmosphere offers.
How Helium Gets Trapped Underground
The same structural geology that traps natural gas can trap helium. Helium generated by radioactive decay migrates upward from basement rock through a network of faults and permeable layers. When it encounters a sealed reservoir, typically a dome or anticline capped by an impermeable layer like salt or tight shale, it accumulates alongside methane and nitrogen.6Petroleum Exploration and Development. Geological conditions, genetic mechanisms and accumulation patterns of helium resources The helium dissolves in formation water, mixes into the gas phase, or occasionally exists as a free phase within the reservoir, depending on pressure and temperature conditions.
Not every natural gas field contains useful helium. Most contain only trace amounts. Extraction is considered economical when the gas contains around 0.3 percent helium or more, and the world’s total helium reserves sit at roughly eight million tons.7ScienceDirect (Elsevier). Optimization of co-production process of cryogenic helium concentration and liquefied natural gas That sounds like a large number until you compare it to demand, which by 2020 had reached about 30,000 tons per year globally.7ScienceDirect (Elsevier). Optimization of co-production process of cryogenic helium concentration and liquefied natural gas At that rate, the known reserves represent a few centuries of supply at most, and demand is growing.
A crucial detail here is that helium is almost always a co-product. Nobody drills a well specifically for helium in most parts of the world. The economics depend on whether the natural gas in the same reservoir is worth extracting. If the gas is not commercially viable, the helium locked inside it stays in the ground regardless of how much we need it.
Where the World’s Helium Reserves Are
Russia holds the largest helium reserves in the world, concentrated primarily in the fields of Eastern Siberia and the Far East.8Energy Reports. Prospects for the global helium industry development But having reserves and actually producing helium are different things. For decades, the United States dominated global production, largely because it maintained a Federal Helium Reserve that stockpiled crude helium extracted from natural gas fields in Kansas, Oklahoma, and Texas. The other major producers are Qatar and Algeria, both of which extract helium from their large natural gas operations.8Energy Reports. Prospects for the global helium industry development
This concentration of supply in a handful of countries creates real geopolitical risk. An analysis of helium trade patterns found that imports carry a relatively high geopolitical supply-risk index, consistent with helium’s classification as a “critical” resource. The risk varies by region, with East Asia, Europe, and the Americas each facing different supply vulnerabilities depending on their trade relationships.9Resources, Conservation and Recycling. Helium resource global supply and demand: Geopolitical supply risk analysis A plant shutdown in Qatar or a pipeline disruption in Algeria can ripple through hospital MRI suites and semiconductor fabs on the other side of the planet within weeks.
Why Helium Shortages Keep Happening
The global helium market has experienced repeated shortage cycles since the early 2010s. Part of the explanation is structural. For years, the US Federal Reserve (the helium stockpile, not the bank) sold off its stored crude helium at prices that undercut what it would cost private companies to build their own extraction infrastructure. That cheap government supply discouraged commercial investment in new helium-recovery plants, so when the reserve began winding down, there was not enough private capacity to fill the gap.10Natural Gas Industry B. A review of helium resources and development
Meanwhile, demand has been accelerating. The Asian semiconductor industry in particular has been consuming steadily more helium for chip fabrication, where ultra-pure helium serves as a cooling and carrier gas in manufacturing processes.10Natural Gas Industry B. A review of helium resources and development Medical imaging adds further pressure. MRI scanners traditionally depend on large volumes of liquid helium to keep their superconducting magnets cold enough to function, and any volatility in helium supply translates directly into siting challenges and operating costs for hospitals.11PubMed Central. A Narrative Review of Advancements in Magnetic Resonance Imaging (MRI) Technology: Evaluating the Shift From Helium-Cooled to Helium-Free Systems
The result is a market that lurches between gluts and shortages. When all major plants are running, supply meets demand. When any single large facility goes offline for maintenance or geopolitical reasons, the market tightens fast because there is almost no slack in the system and you cannot manufacture helium the way you can manufacture nitrogen or oxygen.
What Helium Is Used For and Why It Is Hard to Replace
Helium’s usefulness comes from a set of physical properties that no other element fully duplicates. It has the lowest boiling point of any element, about four degrees above absolute zero, making it indispensable for cooling superconducting magnets in MRI machines, particle accelerators, and quantum-computing hardware. It is chemically inert, so it will not react with the materials it contacts, which matters in semiconductor fabrication, fiber-optic manufacturing, and welding where an inert atmosphere is needed. And it is the smallest noble gas, giving it a unique ability to slip through microscopic gaps, which is why mass-spectrometry leak detectors typically use helium as the tracer gas for finding leaks smaller than conventional methods can catch.12ScienceDirect (Elsevier). Leak detection, calibrations and reference flows: Practical example
Deep-sea diving provides another niche application. At extreme depths, divers breathe helium-oxygen mixtures instead of the usual nitrogen-oxygen air because helium is far less narcotic than nitrogen under pressure. A study of divers performing single deep helium-oxygen dives to 80 and 120 meters found temporary reductions in certain lung-function measures shortly after surfacing, though the effects at the shallower depth resolved within 24 hours.13Diving and Hyperbaric Medicine Journal. Lung function changes in divers after a single deep helium-oxygen dive Despite those transient effects, helium remains the standard breathing gas for deep commercial and military diving because the alternative, nitrogen, causes dangerous narcosis at much shallower depths.
For most of these applications, there is no practical substitute. Hydrogen is lighter but explosively flammable. Neon has a low boiling point but is even rarer and far more expensive. Argon is cheap but boils at a much higher temperature, making it useless for cryogenic cooling. This irreplaceability is exactly what makes helium supply so consequential.
New Places to Look for Helium
One of the more interesting developments in helium exploration has been the realization that helium does not have to come from conventional natural gas fields. In Tanzania’s East African Rift, researchers identified high-nitrogen gas seeps containing up to 10 percent helium, far higher concentrations than typical natural gas fields. The mechanism appears to involve rifting of the continental basement, which fractures ancient rock and releases deeply stored crustal helium. Volcanic activity in the nearby Rungwe province acts as a heat source that drives the helium upward, though the accompanying volcanic carbon dioxide dilutes the helium concentrations in some areas.14Petroleum Geoscience. The principles of helium exploration
This discovery matters because it decouples helium extraction from natural gas production. If helium-rich seeps can be found in rift settings where the geology concentrates helium without a large methane component, it becomes possible to produce helium as a primary product rather than a byproduct. Several exploration companies have begun applying these principles to rift systems and ancient basement terrains around the world, treating helium prospecting more like mineral exploration than oil-and-gas work.
Recovering and Recycling Helium
Because helium cannot be manufactured and escapes Earth’s gravity once released, recycling the helium already in circulation is the most direct way to stretch the supply. Large-scale users like MRI facilities and research laboratories are increasingly installing closed-loop recovery systems that capture helium boil-off, re-purify it, and liquefy it for reuse. One recently described compact recovery system designed for vibration-sensitive laboratory instruments demonstrated a recovery rate above 94 percent, meaning only a small fraction of the helium used was lost to the atmosphere with each cycle.15PubMed Central. An Economical and Efficient Helium Recovery System for Vibration-Sensitive Applications
On the technology side, MRI manufacturers have begun developing systems that drastically reduce or eliminate the need for liquid helium altogether. Helium-free MRI magnets use alternative cooling methods, such as solid-state cryocoolers, that can maintain superconducting temperatures without a bath of liquid helium.11PubMed Central. A Narrative Review of Advancements in Magnetic Resonance Imaging (MRI) Technology: Evaluating the Shift From Helium-Cooled to Helium-Free Systems These machines are still in the relatively early stages of adoption, but if they become standard, they could substantially reduce the single largest source of medical helium demand.
What Helium Isotopes Reveal About the Deep Earth
There are two stable isotopes of helium. Helium-4, the kind produced by radioactive decay, accounts for nearly all the helium we encounter. Helium-3 is far rarer and has a fundamentally different origin: most of it is primordial, trapped inside the Earth since the planet formed from the solar nebula. Geochemists use the ratio of helium-3 to helium-4 as a tracer for distinguishing between mantle-derived and crust-derived gases. Crustal helium, dominated by radiogenic helium-4, has very low helium-3 to helium-4 ratios. Mantle helium, carrying its load of primordial helium-3, has ratios many times higher than the atmospheric baseline.
Samples from mid-ocean ridges in the North Atlantic show helium-3 to helium-4 ratios ranging from about 6.5 to 11 times the atmospheric ratio, with distinct geochemical provinces reflecting different mantle histories.16Earth and Planetary Science Letters. Helium isotopic variations in the mantle beneath the central North Atlantic Ocean At hotspot volcanoes, the ratios climb much higher. Submarine basalts from the Galápagos Archipelago reach up to 23 times the atmospheric ratio, placing the Galápagos alongside Hawaii, Iceland, and Samoa as one of only a few localities with such elevated helium-3 signatures.17PubMed. Mantle plume helium in submarine basalts from the galapagos platform These high ratios indicate the presence of relatively undegassed material rising from deep within the mantle, material that has retained its primordial helium-3 because it has not been processed through the surface recycling of plate tectonics.
In continental settings, the picture is different. Measurements from hot springs and gas seeps in tectonically active zones like the Sichuan-Yunnan block in China show helium-3 to helium-4 ratios well below the atmospheric baseline, indicating that mantle-derived helium is present but heavily diluted by crustal radiogenic helium-4.18PubMed Central. Mantle-Derived Helium Distribution and Tectonic Implications in the Sichuan–Yunnan Block, China For geologists, these isotopic fingerprints are powerful tools for mapping how heat and volatiles move through the lithosphere, identifying mantle plumes, and understanding the architecture of fault systems. For helium explorers, the same data can hint at where commercially viable concentrations might be found, since the geological conditions that concentrate helium underground often leave detectable isotopic signatures at the surface.