Bullsh*t or not?

Let’s find out. We’re checking every claim, one by one.

To save you time, we’ve added screenshots of the most important study results.
You’ll find all sources at the bottom of this article.

It’s not just a vegan meat substitute. In the lab, Soy is a biological trigger for hair growth. Here’s why:

✅ Increases production of IGF-1 (The #1 growth factor for hair)

✅ Repairs the hair cuticle with Cystine-rich amino acids

Sounds good — but does it actually work?

What does Soy Protein really do for your hair?

We aren't talking about eating tofu. We are talking about Hydrolyzed Soy Protein applied to the scalp. It acts as both a "fertilizer" and a "bricklayer":

✔ The "Grow" Signal (IGF-1)
Soy contains isoflavones (like Genistein). These compounds tell the dermal papilla cells to produce IGF-1 (Insulin-like Growth Factor-1). This is the exact molecule that controls how fast and thick your hair grows.

✔ Strengthens the Shaft
Hair is made of protein. Hydrolyzed soy protein is broken down into small amino acids that can penetrate the hair shaft, patching up damage and preventing breakage.

What does the science say?

📌 The IGF-1 Connection (Harada et al.)

A study published in the Journal of Dermatology investigated the effect of Soy Isoflavones on hair growth.

The result: They found that Soy Isoflavones significantly increased the production of IGF-1 in the hair follicles. This massive boost in growth factors led to increased hair growth rates.

How should you actually use it?

Drinking soy milk? It might help a little, but the concentration in your scalp will be tiny.

What does work?

👉 Topical Hydrolyzed Protein:
You need "Hydrolyzed" protein. This means the protein molecules have been chopped up small enough to actually penetrate the skin and hair shaft. Regular protein just sits on top.

👉 Synergy is Key:
Soy provides the "Growth Factor" (IGF-1). It works best when paired with ingredients that clear the path for that growth (like DHT blockers).

Verdict: does Soy Protein work?

✅ Yes. It is a dual-threat: it fuels the biological growth engine (IGF-1) and repairs the physical structure of the hair.

Our take?
Soy Protein is the "architect" of the formula. It ensures the new hair growing in is strong, thick, and supported by high levels of growth factors.

But an architect needs a team. That is why KÁDESO Grow Serum pairs Soy Protein with Saw Palmetto (to stop the DHT attack), Capilia Longa™ (to reset the follicle), and Caffeine (for energy). By combining these ingredients at their clinically proven dosages, we create a formula where the hair isn't just protected—it's actively being rebuilt.

➡️ Want to try it yourself? At least you’ll know you’re using something backed by real science.

Sources

• Harada et al. (2007) – Administration of capsaicin and isoflavone promotes hair growth...
  Study confirming that isoflavones (from soy) increase IGF-1 production in hair follicles, leading to promoted hair growth.