Table of Content
Medically Reviewed By:
Dr. Hema Sathish, MBBS, DD (UK)
Cosmetic Dermatologist
Founder cum Formulator, Healthetc.
Most people experience it at least once.
You try out a new hair supplement. You’re dedicated for a few weeks. You go to check your brush in the morning and… it seems the same, or even worse.
This is where you start to question yourself.
“Does it even work?”
The problem is, most people don’t realize that hair growth isn’t a quick process. Hair behaves according to its biological clock, regardless of your expectations.
That’s precisely why hair supplements take 90 days to produce results, not 15 days.
Your hair is always living in the past
It seems weird, but it is the truth. The hair falling out now has been predestined for weeks.
Hair Growth Phases
- Anagen, the growth stage
- Catagen, the transitional stage
- Telogen, the resting/shedding stage
During any period of stress, nutritional insufficiency, or hormonal imbalance, more hair will be forced into the telogen stage.
However, hair shedding won't occur immediately. The process takes some time. Thus, once you begin supplementing yourself, some hair fall-out has already been planned for the future. That's why when we expect results in 15 days, it sounds reasonable, but from a biological point of view, it's not correct.
The 90-day window is rooted in follicle biology
And 90 days is not a coincidence. That time frame is associated with the reaction of hair follicles, reprogramming, and starting changes in response. (1)
In other words, each hair follicle works as a small independent unit which receives its own nutrition, produces its metabolic processes, and sends its own growth signals.
When you start taking supplements, you are actually slowly changing an environment around the follicle where hair grows.
It includes such actions as:
- Providing more nutrients for the follicles to use
- Reprogramming energy production in cells
- Stabilizing growth regulating pathways
But follicles do not change their phase instantly. They need time to react and do it only at the end of the cycle.
What’s happening inside the follicle
It is important to take into account what occurs at a cellular level.
1. Activation of the dermal papilla and nutrients signaling
The dermal papilla is located at the bottom of each hair follicle and provides growth signaling.
Cells in this structure are affected by such factors as:
- Levels of oxygen
- Amount of amino acids
- Growth factors
- Hormonal signaling
With low nutrient levels, the activity of cells in the dermal papilla slows down, leading to the state of rest in the hair follicle. (2)
In other words, supplements that you are taking restore this signal system. However, these changes require time for the cells to adapt to the altered conditions.
2. Slow synthesis of keratin
Your hair is formed with the help of keratin which is a complex protein synthesized through complicated biochemical reactions.
For keratin synthesis, your organism requires some particular amino acids such as
- L-cysteine
- L-methionine
- L-lysine
However, the process of synthesis depends not only on the presence of these nutrients but also on other factors including:
- Activity of enzymes
- Available ATP
- Micronutrients (such as zinc and various B-vitamins)
That is, despite supplementing yourself with all these nutrients, you will need time to
- Absorb them
- Transport to follicles
- Integrate into the process of hair creation
3. Time needed for telogen to anagen shift
Another important factor explaining why it takes at least 90 days is the process of telogen-anagen transformation.
Telogen hair is dormant; it does not grow.
No matter what supplements you use, these hair follicles will not start growing again immediately.
What these supplements do is stimulate new hair follicles to enter the anagen stage.
Thus
- Existing telogen hairs will fall off.
- New anagen hair will start growing below.
However, these new hairs will need time to grow above the scalp.
In other words, for some time, shedding will continue despite the fact that hair follicles have already started growing underneath.(3)
4. Improvement of blood flow and microcirculation happens gradually
Proper blood supply is crucial for healthy hair growth.
Iron, vitamins, and amino acids contribute to better microcirculation and oxygenation. (4)
Nonetheless, the improvement will happen slowly.
To reach such results, it is necessary to provide hair follicles with nutrients for
- Capillaries to function well;
- Good oxygenation;
- Sufficient nourishing of hair follicles.
What really happens during those 90 days?
If you stick to your routine, the body goes through several stages.
Stage 1: Internal correction
For the first few weeks
- Levels of nutrients improve
- Deficiencies are corrected
- Hormonal signals balance slightly
Hair loss continues or might even increase.
This is due to past effects.
Stage 2: Hair Shedding Stabilises
During week 6 to week 8
- A smaller amount of hair enters the telogen stage
- Hair loss may be reduced slightly
This marks the initial indication of success.
Not drastic, but noticeable if you know what to look for.
Stage 3: Signs of Growth Are Visible
In 90 days
- New hair growth appears
- Baby hair sprouts around the hairline
- Hair texture may feel slightly denser
This marks the period where most notice their supplements work.
Importance of Amino Acids
Many people consider vitamins alone, while amino acids are equally significant.
They are the real constituents of hair.
For instance,
- L-Cysteine builds disulphide bonds giving strength to hair.
- L-Methionine is necessary for sulfur pathways in Keratin formation.
- L-Lysine enhances iron absorption and collagen formation.
In the absence of which, despite adequate vitamins, hair formation will be poor.
This does not mean amino acids provide instant results. They affect the quality of hair that grows, not the one that has grown. Once again, this leads us to the concept of 90 days.
Nutrients require time to get to optimal levels
In the case of hair fall caused by deficiencies, the body will require time to first build back those nutrients.
As in for example
- It takes weeks for iron levels to go up
- Rebuilding Vitamin D takes some time
- Correction of B12 deficiency depends on metabolism
Only after this happens does the body begin reallocating resources to hair growth. But the hair growth cycle still needs time to catch up.
An honest thing many don't say about supplements
It is possible for supplements to fail to provide the intended result.
This is not due to their ineffectiveness but due to another problem.
In the case where hair fall is caused by
- Thyroid problems
- Hormonal imbalance
- Chronic inflammation
Supplements alone cannot help much. They do help but within a wider system of things.
Hair supplement effectiveness indicators
In lieu of dramatic hair growth, seek subtle changes
- Reduced daily shedding
- Increased hair strength
- Decreased hair breakage while brushing
- Slightly new hair growth around the hairline
These changes occur before noticeable density improvements. They can be easily overlooked if you're focused on major results.
What is more important than everything else
Hair reacts to patterns, not haste.
Not taking the supplements regularly or giving up prematurely can interfere with any changes.
It’s not just about nourishing your hair but balancing an inner environment.
It requires time for maintenance.
As long as it’s achieved, effects will be steady.
Conclusion
It is difficult not to feel impatient in situations where there are no immediate results. However, when you learn about the reasons for needing 90 days for hair supplements, everything becomes clear. Because what happens works, just not always in an obvious manner.
Hair does not react to the urge to get results; hair reacts to constancy. And with the passage of time, results usually appear.
Frequently Asked Questions
Why Hair Vitamins Require 90 Days to Work
1. Why don't hair vitamins act within 15 days?
Hair growth happens in cycles. The process of change takes some time to show up in hair.
2. Will 90 days be sufficient to see the effect?
Not always. This period is usually for initial improvement. The result will be even better with continued use.
3. Will my hair fall more after taking supplements?
Yes, because hair grows in cycles and old hairs have to fall off first.
4. Are amino acids effective in stimulating hair growth?
Yes, amino acids produce keratin that makes hair stronger.
5. Should I stop using them if I don't notice the results after one month?
No, hair responds to supplements slowly; hence, the need for more time.
References
- A Double-blind, Placebo-controlled Study Evaluating the Efficacy of an Oral Supplement in Women with Self-perceived Thinning Hair - 2012 Nov - https://pmc.ncbi.nlm.nih.gov/articles/PMC3509882/
- Hair follicle dermal papilla cells at a glance - 2011 Apr - https://pmc.ncbi.nlm.nih.gov/articles/PMC3115771/
- Deciphering the molecular morphology of the human hair cycle: Wnt signalling during the telogen-anagen transformation - 2020 May - https://pubmed.ncbi.nlm.nih.gov/31314901/
- The Role of Vitamins and Minerals in Hair Loss: A Review - 2018 Dec - https://pmc.ncbi.nlm.nih.gov/articles/PMC6380979/
