Everything you want to know before buying.

It is built for men and women concerned about thinning, increased shedding, or simply wanting a more intentional scalp routine. Scalp Defense is a leave-on scalp formula rather than a styling oil for the lengths.

Two things stand out: the clearly stated 8% saw palmetto CO₂ concentration and the lighter carrier architecture. It starts with hemisqualane and coco-caprylate/caprate rather than a dense castor- or coconut-oil base, so it is designed around scalp contact and repeat use.

It is intentionally lighter than a traditional heavy scalp oil, but it is still an oil-based product. Fine hair should start small: target the scalp in sections and avoid flooding the roots. More product is not better.

Saw palmetto is the headline botanical in Scalp Defense, and we would rather tell you the concentration than hide it inside a proprietary blend. CO₂ extraction is particularly useful for the lipophilic fatty-acid and phytosterol fraction that makes saw palmetto scientifically interesting.

DHT is central to androgenetic alopecia biology, and saw palmetto has been studied around 5α-reductase and androgen pathways. The finished Scalp Defense formula itself has not been clinically tested to establish a specific scalp-DHT reduction percentage, so we do not invent one. The Science section shows exactly what the ingredient studies found.

The bottle directions recommend applying a few drops directly to the scalp, massaging gently for about five minutes, using it 5–6 times per week, and leaving it overnight for best results. Consistent targeted use makes more sense than occasional heavy application.

Yes. The cosmetic formula is not gender-specific. Hair thinning can have many causes, though, so sudden, patchy or unexplained loss deserves proper assessment rather than guessing the cause.

You can judge texture and scalp feel quickly. Hair appearance takes much longer because hair cycles are slow. Scalp Defense is a cosmetic and does not have a finished-product clinical trial establishing a guaranteed regrowth timeline, so months—not days—is the sensible timeframe for evaluating any hair-focused routine.

There is no added parfum/fragrance blend. The formula does contain rosemary and peppermint essential oils, which naturally contribute aroma.

Use any “Buy Scalp Defense” button and choose Amazon Canada or Amazon USA. Alrénza.com is the official brand and product-information site; checkout is handled by Amazon.