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PQQ – Pyrroloquinoline Quinone: Benefits and Sources

PQQ (Pyrroloquinoline Quinone) is a bioactive micronutrient with potent antioxidant properties that supports mitochondrial function and is found in foods such as kiwi and soy products.

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Things worth knowing about "PQQ"

PQQ (Pyrroloquinoline Quinone) is a bioactive micronutrient with potent antioxidant properties that supports mitochondrial function and is found in foods such as kiwi and soy products.

What is PQQ?

PQQ, short for Pyrroloquinoline Quinone, is a quinone-like compound first discovered in 1979. It is found in trace amounts in many foods and cannot be synthesized by the human body. PQQ acts as a powerful antioxidant and plays a key role in cellular energy metabolism, particularly in relation to mitochondrial function -- the so-called powerhouses of the cell.

Biological Functions

PQQ fulfills several important roles in the human body:

Antioxidant activity: PQQ neutralizes free radicals and protects cells from oxidative stress, which is linked to aging and various chronic diseases.
Mitochondrial biogenesis: PQQ promotes the formation of new mitochondria, which can enhance cellular energy production.
Neuroprotective properties: Research suggests that PQQ may protect nerve cells from damage and support cognitive function.
Anti-inflammatory effects: PQQ can modulate pro-inflammatory signaling pathways, helping to reduce chronic inflammation in the body.

Dietary Sources

PQQ is found in very small amounts (nanogram range) in a variety of plant-based and animal foods. Rich sources include:

Kiwi fruit
Papaya
Tofu and soy-based products
Green tea
Parsley
Fermented foods such as natto (fermented soybeans)
Human breast milk

Recommended Intake and Supplementation

No official daily recommended intake for PQQ has been established by organizations such as the WHO or the European Food Safety Authority (EFSA). Clinical studies have typically investigated doses of 10 to 20 mg per day in supplement form. PQQ supplements are available as capsules or tablets and are often combined with CoQ10 (Coenzyme Q10), as both compounds synergistically support mitochondrial function.

Deficiency Symptoms

Since PQQ is present in trace amounts in the body and is not classified as a classic essential vitamin, clear deficiency symptoms in humans have not been fully defined. However, animal studies have shown that PQQ deficiency may be associated with:

Impaired growth and development
Alterations in immune system function
Reduced reproductive capacity
Increased susceptibility to oxidative stress

Scientific Evidence and Health Benefits

Growing research interest surrounds PQQ in several health-related areas:

Cognitive function: A Japanese study found that daily PQQ supplementation improved memory and attention in middle-aged and older adults.
Heart health: PQQ may reduce oxidative damage to cardiac tissue and exhibit cardioprotective effects.
Sleep quality: Some studies suggest that PQQ supplementation may have a positive impact on sleep quality.
Energy metabolism: By promoting mitochondrial biogenesis, PQQ may help improve cellular energy production.

It is important to note that many of these studies are still in early stages, and further clinical research is needed to conclusively evaluate the efficacy and safety of PQQ supplementation in humans.

Safety and Interactions

PQQ is considered well tolerated at doses of up to 20 mg per day as used in clinical studies, with no serious adverse effects reported to date. However, the following considerations should be kept in mind:

Pregnant and breastfeeding women should consult a healthcare professional before taking PQQ supplements.
Potential interactions with medications that affect energy metabolism or the nervous system cannot be entirely excluded.
Caution is advised when taking blood pressure-lowering or blood sugar-lowering medications concurrently.

References

Rucker R. et al. - Biochemical functions of pyrroloquinoline quinone (PQQ) as an enzyme cofactor and antioxidant. Journal of Nutritional Science and Vitaminology, 2009.
Nakano M. et al. - Effects of Pyrroloquinoline Quinone (PQQ) on Mental Status of Middle-Aged and Elderly Persons. Food Style 21, 2009; 13(7):50-53.
Harris C.B. et al. - Dietary pyrroloquinoline quinone (PQQ) alters indicators of inflammation and mitochondrial-related metabolism in human subjects. Journal of Nutritional Biochemistry, 2013.

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