The Science Behind Hair Growth - And How To Boost It!

Hair is a funny thing. Everyone’s hair grows at different speeds, and some experience hair loss and thinning. But even that can happen at different ages and stages, and can be caused by numerous factors.

But that doesn’t mean we can’t all amplify our own hair growth... no matter what stage you're in!

A single hair can be split into two parts; the follicle, which sits under the skin, and the shaft, the part of the hair that can be seen, which is where it grows past the skin. The shaft of the hair is actually dead, and that’s why cells need to regenerate all the time! But let’s look at how it works.


Hair, on average, grows half an inch per month, which is 6 inches in a year. Interestingly, hair grows faster in warm weather, or at high altitudes. In fact, it’s the body’s fastest growing tissue! 

There are three stages in the hair growth cycle. So even though people experience hair growth and loss at different ages and speeds, all hair goes through this same cycle. 

1. Anagen: The Growth Stage

This is the stage where the hair follicles receive nutrients and oxygen, which allows the hair strands to grow. It’s the active phase of the cycle, and it can last anywhere between 2 and 8 years.

2. Catagen: The Transition Stage

When hairs stop growing, it means they’ve reached the catagen stage. It stops because it is cut off from retrieving nutrients at the follicle. Hairs can remain at this stage for around 4-6 weeks.

3. Telogen: The Rest Stage

The dead hair is ready to fall out when it reaches the telogen stage. But it can take up to 3 months before the hair finally leaves the head. While it’s waiting, the hair follicles prepare to restart the cycle by generating new hair. It will then enter the pre-anagen stage, ready for another round!


We’ve spoken a lot about hair loss here at Cel, and the science behind it. For a lot of men, it’s an expected inevitability. But for women, it’s almost unspoken. And we want to change that.

80 million men and women in the United States suffer from hair loss and hair thinning, according to the American Academy Of Dermatology. And for many, it can be damaging to their confidence. A loss of confidence can really impact your whole lifestyle, so feeling your best self should be a priority! That’s why we want to give you some advice on how to enhance your hair’s natural growth.

What Is It?

Hair loss occurs when new hair can’t grow back because something is stopping it from doing so. Medically known as anagen effluvium, it can be caused by treatments, habits, or it’s simply genetic.

Here are some examples of what may cause hair loss:

  • Hereditary hair loss
  • A side effect of certain drugs or treatments
  • Immune system disorder
  • Hairstyles that pull on the hair
  • Trichotillomania – compulsion to pull out hairs
  • Using harsh hair products

Genetic hair loss is caused by the hormone, dihydrotestosterone (DHT). It’s a byproduct of testosterone, which is why is far more prevalent in men than in women – although many women still hold the hormone.

Hair Shedding

It's possible to mistake hair shredding for hair loss. Hair shredding is the natural occurrence of hair falling out - the medical term is telogen effluvium. Sometimes certain stressors can cause more hairs to fall out for a period of time, but it’s usually temporary and will fix itself. 

Some common causes of hair shredding are:

  • Sudden weight loss
  • Going through childbirth
  • Stopped taking birth-control pills
  • Excessive levels of stress
  • Undergone an operation
  • Recovering from a high fever illness


Suffering from hair shredding or hair loss can be a stressful experience, but you shouldn’t have to settle for it. There are some ways to enhance your hair growth, giving you more confidence, so you can feel your best self all the time! 

1. Green Tea

Known for its many health benefits, green tea is full of antioxidants, vitamins, and amino acids. Well, its also rich in the antioxidant, catechin, which helps to reduce DTH. Here are a couple of ways you can use green tea for hair growth.

Drinking green tea regularly is good for clearing the body of toxins, which can hinder nutrients from reaching as far as the scalp. Without being fed with nutrition, the hairs struggle to grow.

You can also use those same tea bags from your cup for more direct application. Once the teabags have cooled down but are still wet, squeeze the tea out over the scalp. Leave on for up to 30 minutes and rinse off with cool water.

2. Cel Hair Formula

Here at Cel, we know the importance of hair growth. It’s more than just looking nice, it’s feeling good about yourself, and that’s what we all want to feel.

With extensive research and expert knowledge, we’ve formulated a daily use hair formula, that combats hair thinning and hair loss: our Microstem Hair Growth Formula. We mix science with nature, using Asparagus Stem Cells which are proven to slow down the hair loss process, by providing each strand of hair with keratin.

It doesn’t only slow down hair loss, but it also encourages hair growth by extending the anagen phase, and our selected vitamins and minerals protect and strengthen the hair follicles at the scalp.

3. Diet

What you eat can really make a difference to the health of your hair, because, without the right nutrients, hair can struggle to grow. Two nutrients you need to make sure you have an abundance of, are zinc and vitamin D.

Zinc can be found mostly in meat, but also in shellfish, legumes, seeds, nuts, dairy, and eggs. Zinc is one of the most important minerals for hair growth. Zinc deficiency may be inherited or obtained through certain diets, such as vegetarianism.

Vitamin D helps to create new follicles, which will allow new hairs to grow. People who suffer from severe hair loss often have low Vitamin D levels [ii]. You can retrieve Vitamin D through sun rays, or by eating fatty fish, mushrooms, cheese and fortified foods such as soy milk, cereals, and orange juice. 

4. Onion Juice Hair Mask

It might sound strange, but it’s been suggested that the nutrients found in onions can help with the regrowth of hair, especially for those who lose hair in patches.

Onions contain sulfur, which is a mineral already found in the body, which is essential for the production of enzymes and proteins such as keratin, which is key to hair growth. They also contain antioxidants, which can fight against free radicals which could damage hair follicles.

You can apply onion juice to your scalp by peeling and chopping about 4 onions and extracting the juice from it by squeezing it or using a juicer. Then apply the juice to the scalp and wash off with shampoo after 15 minutes. Daily use will give you the best benefits, but if the smell gets too much, you can mix the onion with essential oils or lemon juice.

5. Cel Shampoo and Conditioner

As with our hair formula, we have developed a hair thickening Microstem Shampoo and Conditioner, which enhances the growth of hair using our mix of nature and science. 

Unlike some shampoos, we don’t use any harsh chemicals which might damage the scalp and dry out the hair, but instead, use nutrients that nourish the follicles. Our shampoo and conditioner are proven to strengthen hair and boost growth.

It contains keratin, the protein that’s vital to healthy, growing hair, as well as Active Panax Ginseng – it stimulates the scalp to fight hair thinning and encourage more hair growth.


Caring about your hair shouldn’t be low on your list of priorities, just because people put it down to vanity. Your confidence affects your ability to do the things you want to do, and we know just how difficult it can be to feel like that’s not the case. These remedies to hair thinning and hair loss can be a way out of that feeling – no more hiding away your locks!