dr Anna Kowalczyk

Probiotics

The effectiveness of probiotics depends heavily on the specific strain and indication — there's no single universal 'best probiotic'.

NMN (Nicotinamide Mononucleotide)

An NAD+ precursor intensively studied in the context of cellular aging — human data are still early, despite huge market popularity.

Resveratrol

The red-grape polyphenol famed as a 'sirtuin activator' — but its bioavailability in humans is very low, which limits the practical relevance of many striking test-tube results.

Which Collagen Should You Choose? Type I, II and III — What the Research Actually Says

Collagen is one of the most commonly bought supplements in Poland, yet few people know that 'collagen' isn't a single substance — it's a family of proteins with different uses. We explain the difference and help you pick the right type.

18 sierpnia 2026

Collagen

Collagen peptides are often used as a supportive measure for skin elasticity and joint comfort — the evidence is promising but still limited.

Vitamin D3

Functionally it acts like a steroid hormone — deficiencies are widespread in Poland, especially during autumn and winter.

Magnesium

A cofactor for more than 300 enzymatic reactions — essential for neuromuscular function, sleep and energy metabolism.

Ashwagandha

One of the best-studied adaptogens — standardized extracts have been shown in clinical trials to lower perceived stress and cortisol levels.

Rhodiola Rosea (Golden Root)

An adaptogen traditionally used for mental and physical fatigue — research is promising, but less extensive than for ashwagandha.

Lion's Mane

A functional mushroom studied for its effect on nerve growth factor (NGF) and cognitive function — human evidence is still preliminary.

L-Theanine

An amino acid from tea leaves, most often paired with caffeine to smooth out its stimulating effect.

Bacopa Monnieri

An Ayurvedic plant studied for long-term memory support — effects appear only after weeks of regular use.

Cortisol

The main stress hormone — essential for short-term survival, but problematic when chronically elevated.

Testosterone

The primary anabolic hormone — its natural level depends heavily on sleep, resistance training, body composition and fat mass.

Berberine

A plant alkaloid sometimes called 'nature's metformin' — studies show a meaningful effect on blood glucose, though it doesn't replace pharmacological treatment.