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Some methods to help your hair grow faster and stronger may include supplements, dietary changes, and topical ointments. That said, more research is needed to examine how the body regulates hair growth.

You’re born with all the hair follicles you’ll ever have. Your head alone has about 100,000 follicles. As you age, some follicles stop producing hair, which is what causes baldness or hair thinning.

In total, the growth cycle for each hair on your scalp can take 2 to 6 years.

Hair growth speed depends on factors like your age, hair type, overall health, and certain medical conditions. Read on to learn what we know about the science behind hair growth and how to use that knowledge for healthier hair.

Hair grows in three stages, and each strand of hair follows its own timeline:

  1. Anagen. The active growth phase of hair lasts 3–10 years.
  2. Catagen. The transition phase where hair stops growing lasts 2–3 weeks.
  3. Telogen. The resting phase where hair falls out lasts 3–4 months.

At any given time, the average scalp has 90 percent of the hair follicles in the anagen phase, about 1 percent in the catagen phase, and about 9 percent in the telogen phase. The last group accounts for the approximately 100 to 150 strands of hair that fall out every day.

Can you increase the anagen phase for hair growth?

How long the anagen phase lasts depends on how long your hair is and if the cells in your follicle base are continuing to multiply and become hair cells.

Hair grows because matrix cells shed some of their structure as they reach the upper follicle. The shed structure combines with keratins to form hair strands that exit your skin’s surface.

Researchers are still looking into what triggers our bodies to switch on the anagen phase, and more studies are needed to know for certain what can be done to promote hair growth.

Still, there are steps you can take that may promote healthy hair during the anagen phase.

Hair is made up of keratin and dead skin cells.

While there’s no direct way to make your hair grow faster overnight, there are steps you can take to keep your hair healthy and long.

1. Keep up with vitamins and nutrients

While many companies promote vitamins or supplements for hair growth, they don’t always directly affect hair length. Your body requires a lot of energy to make your hair grow, so getting too few calories and certain nutrients can affect it.

Generally, it’s best to get your vitamins and nutrients from your diet. Still, you may also look into taking certain supplements — particularly if you have a deficiency.

Below are some of the nutrients commonly touted to promote hair growth and the science behind their efficacy:

Nutrient
Efficacy
Supporting studies
Omega-3 and DHA
may work
One study found that a mackerel oil extract lengthened hair fibers and promoted growth during the anagen phase. It’s important to note that this study was conducted on mice; there is currently no credible research done on humans.
Zinc
may only affect those with a zinc deficiency
Zinc deficiency plays a role in hair loss, with lower levels common in alopecia areata — an autoimmune disorder that causes hair loss.
Biotin (vitamin B7)
may only affect those with a biotin deficiency
While biotin is often promoted for hair growth, there’s not enough evidence to show that it works if you’re not deficient.
Vitamin C
unlikely, and only supported by anecdotal evidence
The antioxidant effects of vitamin C may help prevent oxidative stress that can cause hair to gray and thin out. However, there’s no evidence that vitamin C directly influences hair growth.
Iron
may only affect those with an iron deficiency
Iron deficiency is commonly linked to hair loss. Common signs to look for are hair thinning or more shedding than normal.
Vitamin D
may only affect those with autoimmune hair loss
Studies have found that people with alopecia areata commonly have vitamin D deficiencies, but more research is needed to determine if there is a definitive hair loss link.

A note on supplements

Talk with your doctor before trying supplements like biotin, keratin, or other nutrients. They may interact with any medications you take and cause unintended side effects.

2. Apply essential oils/carrier oils

Put a few drops of tea tree, rosemary, or lime oil into your shampoo or dilute it with jojoba oil.

In one review, researchers found that these three oils can improve scalp health. Still, there is a lack of studies proving that any essential oil will make your hair grow faster.

Another review found that the below essential oils may benefit hair loss treatment:

Avoid applying essential oils directly to your skin. Instead, dilute them in a carrier oil.

While research suggests there are health benefits, the FDA doesn’t monitor or regulate the purity or quality of essential oils. It’s important to talk with a healthcare professional before you begin using essential oils and be sure to research the quality of a brand’s products. Always do a patch test before trying a new essential oil.

For instance, add a few drops of essential oil into 1 ounce (29.6 mL) of carrier oil. Certain carrier oils may even help moisturize your hair:

3. Try topical ointments

Topical ointments are generally recommended for people who experience hair loss and may help your hair grow.

Studies show that the below products promote hair growth and help treat alopecia, or hair loss:

  • Topical melatonin. It may reduce hair loss and increase the anagen growth cycle, according to one review.
  • Topical minoxidil 5 percent (Rogaine). Slows hair loss when used daily for 3 to 6 months.
  • Prescription finasteride (Propecia) topical. According to one preliminary review, this may promote hair growth and reduce the rate of hair loss in androgenetic alopecia, also known as male-pattern baldness.

4. Take keratin supplements

Hair loss is a common symptom of protein deficiency, so taking protein supplements — including keratin — may improve hair health in those who are deficient. Besides this, not much is known about the effects of protein, keratin, and vitamins on hair health.

One test-tube study found that keratin might decrease hair loss, treat damaged hair, and increase hair diameter. Still, more research is needed to better understand how this nutrient might support hair growth.

5. Use a topical protein treatment

Protein helps your hair grow and protects it from chemical and environmental damage. Some studies have indicated that a low protein intake could be associated with reduced hair growth.

Generally, it’s best to get protein from your diet instead of relying on supplements. Good sources include certain vegetables, nuts, yogurt, and foods like lean meat and fish.

If you style or apply heat to your hair often, using a protein treatment may help protect it. You can purchase these products online.

6. Caffeinate your follicles

Caffeine has been shown to promote hair growth, with women being more sensitive to its hair follicle effects.

While more studies are needed on caffeine as a hair growth promoter, preliminary research has shown that topical formulas may decrease hair loss, especially when combined with minoxidil.

Using hair products with caffeine as an ingredient may also help.

This highly rated shampoo from Alpecin combines caffeine with niacin and zinc to promote fuller-looking hair and a thicker texture.

It also contains castor oil for strength and shine. While sold worldwide, Alpecin C1 is considered the most popular caffeine shampoo in Germany.

The cost is $12.45 per bottle.

Pros

  • Ingredients like caffeine and zinc may promote hair growth.
  • Castor oil can provide shine to thinning hair.
  • The effects of caffeine are said to last for 24 hours.

Cons

  • It may take up to 3 months to work.
  • Some customers report that their hair looks better after use, though they don’t notice increased growth speed.

Many factors can affect hair growth, including:

  • genetics or family history of hair loss
  • hormonal changes
  • lack of adequate nutrition
  • certain medications including chemotherapy
  • stress
  • recent weight loss of 20 pounds (9 kg) or more
  • trauma that damages follicles
  • certain diseases or conditions

Women who are pregnant may feel that their hair is growing faster. Meanwhile, those who have just had a baby may feel like they’re losing hair faster than normal.

During pregnancy, the hormone estrogen causes you to have a higher ratio of hair follicles in the growing phase. After the baby is born, hair follicles return to the resting telogen phase, making it appear like you’re shedding hair.

Any concerns regarding reduced hair growth, extremely damaged hair, or any significant changes to your hair should be addressed with a doctor. They can check for possible nutrient deficiencies and recommend specific products that may help.

If you’re experiencing unexplained and/or severe hair loss, you should schedule a checkup with your doctor, as certain health conditions can cause hair loss. In such cases, treating the underlying cause may help reverse hair loss issues.

Boosting hair growth entails healthy hair habits along with an overall healthy lifestyle. Some of the ways you can promote hair growth include the following:

  • Get enough protein in your diet.
  • Avoid extreme or yo-yo dieting and large calorie deficits.
  • Choose hair products tailored to your hair type.
  • Take regular breaks between thermal styling tools.
  • Protect your hair from the sun, chlorine, and other elements.

This depends on your hair type.

While oily and straight hair may require daily washes, you may not need to shampoo daily if you have dry or damaged hair.

If your scalp is slightly oily but your ends are not, try a dry shampoo in between washes.

While there’s a theory that hair grows faster in the summer months and sheds more in the winter, the evidence is anecdotal at best.

Any unusual hair loss should be addressed with a doctor, no matter the time of year.

This may depend on the severity of any underlying hair loss conditions, as well as the treatment method.

For example, minoxidil topical treatments for hair loss may take 3 to 6 months to work, while the correction of any nutritional deficiencies can vary in duration.

Most of the factors that control hair growth are out of your day-to-day control.

The best step you can take is to prevent hair loss and thinning caused by poor nutrition. In other words, be sure to eat a balanced diet and stay hydrated.

Consider consulting your doctor if you experience unusual or significant hair loss. They can check for underlying causes like certain health conditions or nutrient deficiencies.