The Bouf Flouf Factor Growth™ Tonic 50ml, priced at £21.95, is stocked at Boots. Customers report thicker, denser hair after regular use, with some noticing new baby hairs within a month.
What the tonic contains
The tonic is formulated with FGF5 hair tech, developed over seven years by hair microbiologists in Japan. It aims to nourish the scalp and improve hair resilience from root to tip, helping strands look thicker and denser and be held on to longer.
The formula tackles FGF5, a protein that signals when hair should stop growing and fall out. Bouf describes this as a 'timer' — when it goes off too soon, it shortens the hair's growth phase, leading to thinner, weaker hair and more shedding. Managing FGF5 helps keep that timer from going off early, so hair has more time to grow thick and strong.
How to apply the tonic
The tonic should be applied morning and night, with two full droppers' worth to the scalp in a T-shape twice a day, then massaged with a brush or fingers. Bouf states that continual use over 90+ days should result in stronger, longer and denser strands. For best thickening results, twice daily usage for a minimum of three months is recommended.
Customers have praised the formula for not leaving hair greasy and for smelling great, noting it does not need to be washed out even when used in the morning.
Customer reviews and comparisons
On the Boots website, one customer called the formula 'perfection', adding: "Already seeing new baby hairs after a month! Also smells divine."
A mum commented: "I ordered my first tonic when it launched in Australia and I’ve already purchased another two but so happy it's finally available on retail in UK. I have been looking for a product to support/treat my hair loss after my pregnancies and I’m so happy I’ve finally found the one. I am already noticing my hair re-growth and my hair already feels thicker around my scalp, it’s so effective. Losing my hair really impacted my sense of self and identity, with this product I’m finally getting it back! I’m really excited for my hair growth journey with the growth tonic."
Another customer shared: "I love this hair tonic. It actually works I've recommended to all my friends and family. Honestly the best hair growth product I’ve used. It beats the Kerastase serum. It lasts a lot longer and is cheaper than most products on the market."
The Kerastase Anti Hair-Fall Serum is more expensive at £23.50 for 30ml, though it has loyal fans — more than 2,800 people have rated it five stars on the Kerastase website, praising the formula enriched with aminexil, ginger roots and edelweiss native cells.
Someone else explained: "After trying so many hair growth products I've finally found one that works. You have to apply twice a day and be patient, after 6 weeks new hairs are appearing, it takes time but it's definitely working for me."
Not everyone had the same results. One person wrote: "I used the tonic water and leave in conditioner persistently for a month and nothing changed my hair didn’t get better or worse."
A final buyer commented: "I bought in Australia and I am so happy it’s now in the UK to repurchase! Hair line has thickened so much in 2 months and still have so much left in the bottle." Another said: "Best thing I've ever used. Bought this in March and my hair is so thick and full! Bought my next bottle."
