How much hydrogen actually reaches the bloodstream? This is what science says about H₂ inhalers, nasal cannulas, and reservoir masks.

Does a small hydrogen inhaler really deliver enough H₂ – or is a high flow rate (ml/min) necessary? And how safe is the whole thing with regard to the 4% limit, which is emphasized by the Molecular Hydrogen Institute (MHI) and new systems like InH2ale?^[1][2][3]

In this article, we show how much hydrogen is produced at different flow rates. can physically arrive in the blood, how nasal cannula and reservoir mask differ and how the most important AquaVolta® and Pulmovolta® inhalers (150–2000 ml/min) can be classified in light of the available measurement and study data.^{[4][5][6][7][8]} The structure of this article follows the current respiratory physiology model of LeBaron, Ohno et al. (Respiratory Research, 2026), the the Fraction of Inspired Hydrogen (FiH₂) established as a standardized dose size for H₂ inhalation.^[38]

1. Why this question is important

Molecular hydrogen (H₂) has been scientifically investigated for years in preclinical and clinical studies – including with regard to its possible role as a signaling molecule and in interaction with reactive oxygen species.^[5][9] This is basic research; there are currently no reliable health-related claims about H₂ that are approved under EU law.

The question of how much H₂ actually reaches the body depends not only on the amount of gas (ml/min), but above all on... how much H₂ the lungs actually absorb and what H₂ level is reached in the blood.^[10][4]

At the same time, expert groups such as the MHI warn against uncontrolled gas concentrations above approximately 4 vol-% H₂ in air, as this falls within the range of the physical explosion window of hydrogen.^[3][11][1] New systems like InH2ale therefore explicitly build their security communication on a controlled FiH₂ (Fraction of inspired Hydrogen) below 4% .^[2][12][13] The term FiH₂ as a standardized, respiratory-physiologically derived dose metric – analogous to the established FiO₂ (Fraction of Inspired Oxygen) – was first used in 2026 in the model study by LeBaron, Ohno et al. Respiratory Research formalized.^[38]

2. What studies on hydrogen inhalation show

Several clinical and experimental studies have investigated the pharmacokinetics of H₂ inhalation.^[5][10] A scientific study of humans is particularly revealing, in which 3% or 4% H₂ in air/O₂ The H₂ level in the blood was inhaled through a mask and measured in real time.^[4] This study served to assess safety and feasibility, as well as to measure the distribution of H₂ in the blood. It should be understood here solely as a physical-pharmacokinetic reference – no health benefits for users are implied.

• At 3–4 vol% H₂ in the inhaled air, the H₂ level in the blood rose within approximately... 20 Minutes onto a plateau.^[4]
• This plateau was typically at about 10–20 µM (micromoles per liter) dissolved H₂ in the blood, with a range of roughly <1 to ~25 µM – depending, among other things, on the mask fit.^[4]
• After inhalation ceased, the H₂ level dropped again with half-lives in the range of minutes; the gas was predominantly exhaled via the lungs.^[10][4]

The current model study puts these measurements into a physical context: Henry's law results in an H₂ blood level of approximately [value missing] at equilibrium. 6 µM per 1% FiH₂; measured correspond 1–4% FiH₂ approximately 5–28 µM H₂ in the blood – in very good agreement with Henry's calculation.^[38][4] This results in a helpful rule of thumb: For every 1% H₂ in the actually inhaled air, one can expect approximately 6 µM H₂ in the blood at equilibrium.; the therapeutically discussed window is 1–4% FiH₂.^[38][5][4]

3. Physical principles: Respiration, solubility, plateau

3.1 Minute ventilation

• According to classic textbook guidelines, a resting adult breathes approximately... 6 L / min (0,5 L tidal volume × 12 breaths).^[14][15][16]
• In practice, however, the minute ventilation during waking hours is often higherEven sitting, talking, or light activity can cause symptoms. 8–13 L/min Normally, the pure resting value of 6 L/min usually underestimates the actual dilution.^{[38][17][18][19]}

3.2 Solubility of H₂ in blood (≈ water)

• Water (and therefore also blood) can, at normal pressure, have a maximum volume of approximately... 1,6 mg/L H₂ to solve.^[20][21]
• This corresponds to approximately 1,6 ppm or approximately 800 µM – this is the theoretical saturation limit.^[21][22][20]

3.3 Plateau after about 20 minutes

• With constant H₂ inhalation, after approximately... 20 Minutes one (for the respective setting) stable plateau in the blood.^[10][4]
• Longer inhalation (30–60 minutes) primarily increases the Total dose over time (AUC), no longer the peak value.^[23][4]

Important: The H₂ levels of 10–20 µM observed in human studies are far below the maximum solubility of ~800 µM – so we are seeing a functional plateau, not the physical upper limit.^[22][5][4]

3.4 Reference table: FiH₂ → Blood H₂ (Henry's Law)

The model study provides the authoritative allocation of inspired H₂ fraction to dissolved H₂ in plasma (37 °C, water vapor corrected) calculated via Henry's law:^[38]

Therapeutically discussed window according to study: 1–4% FiH₂ ≈ 5–28 µM H₂ in the blood.^[38]

4. Nasal cannula vs. mask with reservoir bag

4.1 Nasal cannula – Main form of use for comfort

In practice, most users utilize our H₂ inhalers over a Nasal cannula, because this is significantly more comfortable than a tightly fitting mask.^[24][25] However, this process has effects that reduce the effective H₂ supply:

• When exhaling, some of the gas simply flows past the mouth and nose into the room.
• The gas jets from the cannula mix with room air before being inhaled.
• Many people breathe through their mouths at times, which further reduces the proportion of H₂-rich flow.

For these reasons, it is realistic and conservative to assume approximately [value missing] for H₂ inhalation via nasal cannula. 50% "efficiency" To be on the safe side: The device produces, for example, 300 ml/min, but on average, something like 150 ml/min actually arrives in the inspired airflow.^[24][25][4] The model study summarizes this mixing factor as Efficiency η – more on this in section 4.3.^[38]

Advantages: Maximum comfort, suitability for everyday use, high compliance.
Disadvantages: The inspired H₂ fraction (FiH₂) can only be expressed as roughly estimate, which is why we work with conservative assumptions.

4.2 Mask with reservoir bag – option for maximum control

A Mask with reservoir bag (typically about 2–3 liters volume) allows for significantly more precise control of the FiH₂:^[13][2]

• The bag is continuously filled with H₂.
• When inhaling, the person primarily takes gas from the bag, not from the room air.
• This means that, approximately: FiH₂ ≈ H₂ flow (ml/min) / minute ventilation volume (ml/min).

Advantages:

• FiH₂ can vary depending on minute volume and device settings. very well calculated and kept below 4% will be – exactly in line with the safety approaches of MHI and InH2ale.^[1][2][3]
• With a smaller device (e.g. 150 ml/min) a normally breathing person (6–8 L/min) can already achieve FiH₂ in the range of about 2–3%.^[16][14]

Disadvantages:

• Less comfortable: mouth and nose are completely covered.
• The reservoir bag (e.g., about 3 liters) hangs visibly in front of the mask; many find this less comfortable in the long run.

4.3 Why the “50% factor” varies individually (η)

The approximation factor used in this article (F)_eff ≈ 0,5 × F_raw) is a practical average. The model study introduces a Efficiency η one that is strongly influenced by Nasal patency depends: With good nasal breathing, η is approximately 0,85, while with restricted patency it is significantly lower.^[38]

Relevant for practical application: Approximately 10–15% of adults - and 20–25% of those over 65 – have such limited nasal patency that only η ≲ 0,6 is achieved via a low-flow nasal cannula.^[38] Mouth breather They also absorb significantly less H₂ through the nasal cannula.

Consequence: Those who primarily breathe through their mouth, have a blocked nose, or want to precisely control the FiH₂ should use the Reservoir mask More reliable – it avoids the fluctuations of the nasal cannula. This aligns with the general recommendation in respiratory physiology to switch to a mask if nasal patency is poor.^[38]

Our recommendation: The Nasal cannula remains the Main use (comfortable, suitable for everyday use). The Reservoir mask is an optional professional solution:

• for users who want to control FiH₂ very precisely,
• those who want to work in a particularly gas-saving way with a smaller device,
• or those who deliberately want to orient themselves towards the 4% FiH₂ line – similar to InH2ale, but with different hardware.^[2][13]

5. How much H₂ do our inhalers deliver? (Nasal cannula, rest)

First, we consider the situation of a single person calmly with approximately... 6 L/min minute volume and the use of a nasal cannula.^[14][16] As a general rule:

• Theoretical H₂ fraction (without losses): F_raw = H₂ flow / (H₂ flow + 6000)
• Effective inspired H₂ fraction with nasal cannula (50% factor): F_eff ≈ 0,5 × F_raw

5.1 Inspired H₂ percent via nasal cannula (6 L/min)

Even a 150 ml/min inhaler, when used via a nasal cannula, roughly results in about 1–1,5% H₂ in the inhaled air at rest – within the range of values ​​measured in many human studies (1–3%).^[5][4] A 300 ml/min device has a flow rate of approximately 2–3% H₂, which is very close to the 3% used in the cited study.^{[4][6][7][8][26][27][28][29][30]}

5.2 Estimated H₂ levels in the blood (plateau after ~20 minutes)

Based on Henry's law (≈ 6 µM per 1 % FiH₂) and the human study (3–4 % H₂ → plateau 10–20 µM, measured 5–28 µM at 1–4 % FiH₂), the following can be approximated:^[38][5][4]

C_{Blood, central} ≈ 6 µM × F_eff (in %)

with realistic variation (individual variability, respiration, cannula position) of approximately 0,6–1,6 times this value.^[38][4]

* Computational extrapolation above the range measured in studies (see methodology note above). Values ​​above 665 ml/min are above the therapeutic 1–4% window and should be throttled, used with a reservoir mask, or in multi-user mode.

Even a 150 ml/min inhaler reaches this level after about 20 minutes of inhalation via nasal cannula. H₂ levels of a few µM in the blood – on the order of magnitude that was measured in human studies with 1–2% H₂ in the breathing gas.^[6][5][4] A 300 ml/min inhaler, with a phosphor level of around 15 µM, falls within the core range of the 3% studies (10–20 µM).^[4] Larger devices (Cavallo, Highdrogen) theoretically raise this plateau further, but remain far below the theoretical saturation, as lung capacity and solubility impose natural limits.^[22][23][4]

6. Athletes & tall people: When breathing 10 L/min

People who breathe very deeply or quickly (e.g., athletes, tall men, breathing exercises) can easily 10 L/min or more .^[18][19][17] Then the same H₂ flow is diluted more, and the inspired H₂ fraction decreases accordingly.

At 10 L/min (10000 ml/min) and nasal cannula, the following results:

• F_raw = H₂ flow / (H₂ flow + 10000)
• F_eff ≈ 0,5 × F_raw

6.1 Example values ​​at 10 L/min (nasal cannula)

* Above the therapeutic 1–4% window; here, throttling, multi-person use (see section 7) or a safety-oriented reservoir mask configuration (section 8) is recommended.^[38]

At higher minute volumes of breathing, a Larger device advantages, because it keeps the blood plateau within the range of study values ​​despite greater dilution.^[5][4] For athletes, deep breathing, or users who want to remain active during inhalation, the Pulmovolta® Cavallo 1000 or the Pulmovolta® Highdrogen® H2K 3000 Therefore, it makes physiological sense – especially when several people inhale at the same time.

7. Multi-user use with T-pieces

A practical advantage of the AquaVolta®/Pulmovolta® inhalers: T-pieces are included in the scope of delivery – typically one for smaller devices, several for larger ones – so that two to four people at the same time can inhale.^{[27][30][7][8]}

7.1 Example: Pulmovolta® Cavallo 1000 (approx. 665 ml/min H₂)

• 2 people: approx. 330 ml/min H₂ each → at 8–10 L/min minute ventilation per person FiH₂ roughly 3–4 % → blood H₂ about 18–24 µM per person.
• 3 people: approx. 220 ml/min each → FiH₂ approx. 2–3 % → Blood H₂ roughly 12–18 µM.
• 4 people: each approx. 165 ml/min → FiH₂ by 1,5–2 % → Blood H₂ about 9–12 µM, still in the lower, but clearly study-relevant range.^[38][5][4]

7.2 Example: Pulmovolta® Highdrogen® H2K 3000 (2000 ml/min H₂)

• 2 people: approximately 1000 ml/min H₂ each – here, performance and minute ventilation should be deliberately combined so that FiH₂ per person is kept in the range of 2–4%.^[30][8][1]
• 3-4 people: 3× ~650–700 ml/min or 4× ~500 ml/min → per person similar to the Cavallo single-user or slightly below, with a higher respiratory volume (10–12 L/min) well within the study-relevant range.

Larger devices like Cavallo and Highdrones thus enable both a higher individual plateau as well as the Simultaneous operation for multiple people.

8. Safety: 4% limit, flame window and "inhale-ready" configurations

Hydrogen in air is physically present from about 4 vol-% flammable; the flammability window is approximately between 4 and 75 vol-%, with maximum ignitability at ~18 % H₂.^[11][3][1] MHI and systems like InH2ale therefore base their safety philosophy on an inspired hydrogen fraction. below 4% .^[3][1][2] The model study confirms this line of reasoning: H₂ itself shows no discernible biological toxicity even at high concentrations – the main reasons for an upper limit on FiH₂ are Flammability and oxygen displacement (hypoxia), not the hydrogen itself; above 4% FiH₂ there is no proven additional benefit with increasing risk.^[38]

With a suitable Reservoir mask AquaVolta®/Pulmovolta® inhalers can also be operated very well within this framework:

• A normal person with a minute ventilation of 6–8 L/min:
  – 150 ml/min → FiH₂ ≈ 2–2,5 % (below 4 %)
  – 300 ml/min → at 8 L/min ≈ 3,75% (also below 4%).^[16][2][14]
• Athletes with 10 L/min:
  – 300 ml/min → FiH₂ ≈ 3 %; a Cavallo can be throttled to 300 ml/min to remain in the “sweet spot” of 2–4 % at high tidal volume.^[7][17][18]

This allows AquaVolta®/Pulmovolta® systems to be used as “Inhale-ready” configure: Standard via nasal cannula for maximum comfort and Optional with reservoir mask, if particularly precise control of the FiH₂ and economical operation with smaller devices is desired.^[13][2][24]

9. Practical recommendations: Which inhaler for whom?

9.1 150 ml/min – mobile entry (Pulmovolta® H2 Mobil 225)

• Target group: Individual users, beginners, mobile use.
• Nasal cannula, 6–8 L/min: FiH₂ ≈ 1–1,5%; Blood H₂ ≈ 4–12 µM after ~20 minutes – within the range of H₂ uptake measured in human studies (1–2% H₂).^[6][4][5]
• With reservoir mask: FiH₂ ≈ 2–2,5% at 6–8 L/min – safely below 4%, with blood values ​​close to those used in studies, similar to the InH2ale approach.^[2][3]

→ View Pulmovolta® H2 Mobil 225

9.2 300 ml/min – more reserve for individual users

• Target group: Individual users with a focus on higher H₂ throughput and more flexibility in application duration and breathing volume.
• Nasal cannula, 6 L/min: FiH₂ ≈ 2–3 %; Blood H₂ ≈ 9–23 µM – very close to the 3-% studies.^[4][5]
• Reservoir mask, 8–10 L/min: FiH₂ ≈ 3–4 %, safely below 4 %, well suited for more athletic users.

→ View AquaVolta® Nafion 117 (300 ml/min)

9.3 665 ml/min – Pulmovolta® Cavallo 1000

• Target group: Families, practices, studios, multi-users.
• Single user, nasal cannula, 6 L/min: FiH₂ ≈ 5%; Blood H₂ ≈ 18–48 µM – stronger plateau. Since this value is calculated to be above 4%, the device should be throttled, used with a reservoir mask, or with a higher tidal volume to remain within the recommended range below 4%.
• Multi-user with T-pieces: two to four people simultaneously with study-relevant H₂ levels per person.^[27][7]

→ View Pulmovolta® Cavallo 1000

9.4 1500–2000 ml/min – Pulmovolta® Highdrogen® H2K 3000

• Target group: Professionals, practices, multi-user devices, high respiratory volumes, special protocols.^[29][8][30]
• Individual in peace: Calculated high FiH₂ values. Here, power output and minute volume should be deliberately combined so that FiH₂ remains below 4% – with a nasal cannula at rest, this device is above 4% and should therefore be throttled or operated with a reservoir mask or for multiple users.^[1][3]
• Multiple people + T-pieces: 2-4 people simultaneously – ideal for professional settings.

→ View Pulmovolta® Highdrogen® H2K 3000

10. Conclusion: Small devices are powerful – large devices are flexible.

• Yes, larger inhalers increase the calculated hydrogen content in the blood: The plateau after approximately 20 minutes depends directly on FiH₂ and increases with higher flow, provided that minute ventilation and application method remain the same.^[38][10][4]
• No, small devices are by no means "ineffective": Even 150 ml/min via nasal cannula achieves H₂ levels in the range of values ​​measured in human studies; with a reservoir mask, even 2–3% FiH₂ can be achieved safely and in a gas-saving manner.^[2][6][5][4]
• What matters is FiH₂, not the pure ml/min figure: The flow rate required for 1–4% FiH₂ varies between ≈ 60 ml/min and over 5.000 ml/min depending on respiration and interface – “flow rate alone does not equal FiH₂”.^[38]
• The nasal cannula remains the primary recommendation: It is significantly more comfortable to wear and, despite some losses, delivers sufficient H₂ to achieve blood levels close to those used in studies.^[25][24][4]
• The mask with reservoir bag is the precision tool: Those who want to strictly adhere to the 4% limit for FiH₂ and achieve maximum efficiency with smaller devices can turn a normal inhaler into an "inhale-ready" system – with the compromise of reduced wearing comfort.^[13][2]

In summary: Even the smaller devices achieve H₂ blood concentrations on a scale documented in scientific measurements. Larger systems like Cavallo and Highdrogen increase the H₂ throughput, enable multi-user operation, and maintain the blood level within this measurement range even with rapid breathing or multiple users. An optional reservoir mask allows for precise and controlled adjustment of the inspired H₂ concentration to below 4%. No health benefits beyond the measured H₂ intake are explicitly claimed.

Safety, limitations, and when you should not use H₂ inhalation without consulting a doctor

Hydrogen inhalation is a wellness treatmentThis product is not a substitute for medical diagnosis, advice, or treatment. We particularly recommend consulting a doctor before use in the following cases:

• in the case of existing illnesses, especially of the respiratory tract or lungs,
• during pregnancy and breastfeeding,
• in children and adolescents,
• after surgery or in case of acute symptoms,
• when taking medication regularly.

If you experience discomfort, dizziness, or other unusual symptoms during use, stop inhaling and consult a doctor if necessary. Also, observe the safety instructions regarding the flammability of hydrogen in section 8 and the operating instructions for your specific device.

Transparency note: aquacentrum.de distributes the AquaVolta®/Pulmovolta® inhalers mentioned in this article. Therefore, this article contains links to their own product pages. The scientific sources (studies and specialist publications) are independent of this.

Frequently asked questions about H₂ inhalation and blood uptake

What does FiH₂ mean and why is it more important than ml/min?

FiH₂ (Fraction of Inspired Hydrogen) is the proportion of hydrogen in the actually inhaled air – the actual "dose" that reaches the lungs. The device's output in ml/min alone does not indicate this, because the H₂ gas is diluted with room air before inhalation. According to a respiratory physiological model (LeBaron, Ohno et al., Respiratory Research 2026), the effective therapeutic window is 1–4% FiH₂, which corresponds to approximately 5–28 µM hydrogen in the blood. The required H₂ flow rate depends on the tidal volume and the interface and can range from approximately 60 ml/min to over 5.000 ml/min.

How much hydrogen reaches the bloodstream when inhaled?

In pharmacokinetic measurements, the H₂ concentration in the blood reached a plateau of approximately 10–20 µM after about 20 minutes when the inhaled air contained 3–4% H₂. According to Henry's Law, 1–4% FiH₂ corresponds to approximately 5–28 µM dissolved H₂ in the blood (≈ 6 µM per 1% FiH₂). The exact concentration depends on the flow rate, inhalation volume, and the method of administration – nasal cannula or reservoir mask.

Is hydrogen inhalation safe?

Hydrogen is flammable in air at concentrations of approximately 4% by volume. Inhalation systems are therefore designed to ensure that the inhaled H₂ fraction (FiH₂) remains below 4%. During use, avoid open flames, sparks, and smoking, and follow the manufacturer's instructions. H₂ inhalation is a wellness treatment and not a substitute for medical care.

How long should one inhale hydrogen?

In measurement studies, the H₂ level in the blood reaches a plateau after about 20 minutes. Longer applications primarily increase the total dose over time, not the peak value. Typical application durations range from about 20 to 60 minutes.

Nasal cannula or reservoir mask – which is better?

The nasal cannula is more comfortable and suitable for everyday use, but delivers a hydrogen fraction that can only be roughly estimated. The reservoir mask allows for a precise, easily calculable fraction of hydrogen and particularly economical operation – albeit with reduced wearing comfort. For those with impaired nasal patency or mouth breathing (according to the study, 10–15% of adults, 20–25% of those over 65), the mask is clearly superior. For most users, the nasal cannula is the primary solution.

Published on May 22, 2026 · Last updated on May 30, 2026 · Authors: Karl Heinz Asenbaum (Author & Researcher) Yasin Akgun (Dipl.-Ing. TU Munich).

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