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NOW Supplements Vitamin D-3
SCIENTIFIC SCORE
Possibly Effective
Based on 12 Researches
7.5
USERS' SCORE
Excellent
Based on 12 Reviews
9
Supplement Facts
Serving Size: 1 Softgel
Amount Per Serving
%DV
Vitamin D3 (as Cholecalciferol) (from Lanolin)
10 mcg (400 IU)
50%

Top Medical Research Studies

8
Vitamin D deficiency linked to allergies
Does vitamin D deficiency predispose to allergic proctocolitis?
Strong association with allergies
We investigated the potential connection between vitamin D deficiency and allergic proctocolitis (AP) in infants. Our study involved a careful comparison of vitamin D levels in infants diagnosed with AP against those of healthy infants. This meticulous, prospective approach allows us to draw insightful conclusions about how vitamin D might be influencing allergic conditions.

We found that vitamin D levels were noticeably lower in infants suffering from AP compared to their healthy peers. Notably, a significant percentage of AP patients—34.7%—were found to be vitamin D deficient or insufficient. Furthermore, the study revealed that infants with vitamin D levels below 40.75 mcg/L were 3.5 times more likely to develop AP.

Our findings suggest an intriguing association between vitamin D deficiency and allergic proctocolitis, hinting that the rising rates of such allergies may be influenced by environmental factors. It appears crucial that we assess vitamin D levels in infants diagnosed with AP, as this could contribute to better understanding and management of the condition.
Read More
8
Vitamin D3 impacts allergy severity
Correlation Between a Deficiency of D3 Levels and the Development of Allergic Rhinitis.
Strong correlation noted in study
We explored the relationship between vitamin D3 levels and allergic rhinitis (AR), a common condition characterized by sneezing, runny noses, and itchy eyes. In our research, we included two groups: thirty individuals with AR between the ages of 18 and 35 who had low levels of vitamin D3 and a control group of thirty people with sufficient vitamin D3 levels.

Our findings revealed a notable difference between the two groups. We observed that patients with AR had significantly lower levels of vitamin D3 compared to the control group. Additionally, there was a marked increase in immunoglobulin E (IgE) levels, which are often linked to allergic reactions, among those with AR.

Interestingly, our analysis indicated a clear inverse relationship between vitamin D3 levels and IgE levels. In fact, we found that changes in vitamin D3 levels accounted for about 58% of the variations in IgE among the participants. This suggests that increasing vitamin D3 might help reduce IgE levels and potentially lessen allergy symptoms.
Read More
7
Vitamin D effects on asthma explored
Low CD46 expression on activated CD4 T cells predict improved Th1 cell reactivity to calcitriol in majority of patients with allergic eosinophilic asthma and healthy donors.
Relevant study on vitamin D
We explored the role of vitamin D, specifically calcitriol, in managing allergic eosinophilic asthma and how it interacts with a key molecule, CD46, in T cells. Our research involved stimulating CD4 T cells from patients and healthy donors with specific antibodies and measuring the production of two important immune signals: IFN-γ and IL-10.

Our findings suggest that lower levels of CD46 on activated CD4 T cells are linked to a more favorable Th1 cell response to calcitriol. This means that individuals with certain profiles might benefit more from vitamin D supplementation, potentially reducing inflammation associated with their asthma.

However, we need further validation of these results in clinical settings. If proven effective, this stratification could pave the way for personalized treatments for people with allergic conditions and possibly other diseases influenced by immune responses.
Read More

Most Useful Reviews

9.5
Helpful for children
Excellent product; it did not cause allergies. I give my child 2 capsules now, although 400 IU might not suffice based on recommendations. They have started to experience less pain.
Read More
10
Ideal for children
The 400 IU dosage recommended by WHO for children is ideal. The supplements I found previously in Russia contained minimal doses, requiring me to give 10-15 capsules, which was inconvenient for both me and the children. Since I discovered iHerb, these vitamins have been perfect. They cause no allergies, are small capsules that my children take at bedtime, and they have shown remarkable growth and energy. I also give them Omega from the same brand. There were only a few interruptions in taking them when I forgot to reorder.
Read More
10
Well absorbed
Perfectly! This is the best Vitamin D3 from iHerb! My doctor recommended I take 2000 IU during pregnancy, so I take 3 capsules each morning. It does not cause any allergies, is well absorbed, and is easy to swallow due to its small size.
Read More

Medical Researches

SCIENTIFIC SCORE
Possibly Effective
Based on 12 Researches
7.5
  • All Researches
9
Vitamin D aids asthma management
Correlation Analysis of Serum 25-Hydroxyvitamin D Levels With Immune Function and Calcium-Phosphate Metabolism in Patients With Bronchial Asthma Treated With Combination Therapy.
Combination therapy assessed effectiveness
We explored the effects of vitamin D in combination with fluticasone propionate on allergy-related symptoms in children with bronchial asthma. In this study, we grouped participants into two treatment plans: one group received only fluticasone, while the other group received both fluticasone and vitamin D. By comparing their progress, we noted various health improvements related to asthma control.

The findings highlighted that the children who received the combination therapy experienced quicker relief from asthma symptoms, such as wheezing and shortness of breath. Their overall lung function also improved, as seen in measures like forced vital capacity and peak expiratory flow. Moreover, the kids taking vitamin D showed better immune responses, indicated by increased levels of specific immunoglobulins and lymphocytes important for fighting off infections.

We also observed significant improvements in well-being and quality of life for those in the combination group. However, it's essential to note that while vitamin D appears to offer additional benefits when taken alongside traditional asthma treatments, the study did not focus solely on vitamin D's effects. Overall, the data suggest that vitamin D could play a positive role in managing allergies associated with asthma, but further research is needed to isolate its effects conclusively.
Read More
9
Vitamin D metabolites aid pulmonary health
Beneficial Impact of Inhaled 25(OH)-Vitamin D3 and 1,25(OH)2-Vitamin D3 on Pulmonary Response in the Murine Model of Hypersensitivity Pneumonitis.
Addresses vitamin D's role in HP
We explored the impact of vitamin D metabolites on respiratory health, particularly in the context of hypersensitivity pneumonitis (HP). Our study focused on C57BL/6J mice that were placed on a diet severely lacking in vitamin D to induce deficiency. These mice were then exposed to an antigen linked to HP while inhaling either 25(OH)-vitamin D3 or 1,25(OH)2-vitamin D3.

Over the course of the experiment, we observed significant changes in the respiratory function of vitamin D-deficient mice. The metabolites of vitamin D we tested seemed to counteract many adverse effects associated with vitamin D deficiency. Inhalations of these compounds not only improved respiratory functions but also reduced inflammation and fibrosis that was exacerbated by the HP-causing antigen.

This research suggests that inhaling vitamin D metabolites may restore normal levels of active vitamin D in the lungs of deficient mice, providing a promising avenue for further exploration into how vitamin D may help manage respiratory conditions related to allergies and hypersensitivity.
Read More
8
Vitamin D deficiency linked to allergies
Does vitamin D deficiency predispose to allergic proctocolitis?
Strong association with allergies
We investigated the potential connection between vitamin D deficiency and allergic proctocolitis (AP) in infants. Our study involved a careful comparison of vitamin D levels in infants diagnosed with AP against those of healthy infants. This meticulous, prospective approach allows us to draw insightful conclusions about how vitamin D might be influencing allergic conditions.

We found that vitamin D levels were noticeably lower in infants suffering from AP compared to their healthy peers. Notably, a significant percentage of AP patients—34.7%—were found to be vitamin D deficient or insufficient. Furthermore, the study revealed that infants with vitamin D levels below 40.75 mcg/L were 3.5 times more likely to develop AP.

Our findings suggest an intriguing association between vitamin D deficiency and allergic proctocolitis, hinting that the rising rates of such allergies may be influenced by environmental factors. It appears crucial that we assess vitamin D levels in infants diagnosed with AP, as this could contribute to better understanding and management of the condition.
Read More
8
Vitamin D aids atopic dermatitis management
Vitamin D Supplementation for Treating Atopic Dermatitis in Children and Adults: A Systematic Review and Meta-Analysis.
Relevant to allergic conditions
We conducted an extensive review of multiple studies to understand how vitamin D might influence atopic dermatitis (AD), a skin condition that impacts many people, particularly children. Our focus was on randomized controlled trials that compared vitamin D supplementation with a placebo group.

After analyzing data from eleven studies involving a total of 686 participants, we found compelling evidence that vitamin D supplementation can significantly reduce the severity of AD. Participants who received vitamin D showed a marked improvement compared to those who did not, with a notable decrease in their disease severity scores.

It's important to highlight that while our findings are promising, we also recognize the need for larger and longer-term studies to confirm these results. By understanding the role of vitamin D, we can better explore potential treatments for managing allergy-related conditions like atopic dermatitis.
Read More
8
Vitamin D3 may support asthma treatment
Correlation Analysis of Serum 25-Hydroxyvitamin D Levels With Immune Function and Calcium-Phosphate Metabolism in Patients With Bronchial Asthma Treated With Combination Therapy.
Limited isolated vitamin D3 effects
We investigated the effects of combining vitamin D3 with fluticasone propionate inhalation aerosol in children with bronchial asthma. Our study involved 110 patients who were divided into two groups: one receiving only the inhalation treatment and the other receiving both the inhalation treatment and vitamin D3. By comparing these groups, we aimed to understand how vitamin D3 could potentially enhance immune function and improve symptoms related to asthma.

Results indicated that the group receiving the combination treatment experienced a quicker relief from symptoms like wheezing and dyspnea. They also showed marked improvements in lung function and quality of life. Particularly interesting was the observation that this treatment regime increased serum levels of vitamin D3, several immunoglobulins, and T lymphocyte subsets, which are important for immune health. Furthermore, the combination was linked with beneficial changes in calcium and phosphorus levels in the bloodstream.

However, while our findings suggest a positive relationship between vitamin D3 levels and immune function, we should note that the isolated benefits of vitamin D3 alone on allergies could not be conclusively determined. The results highlight potential benefits, but more research would be necessary to pinpoint vitamin D3's role specifically in allergy management, independent of other treatments.

Overall, our exploration reinforces the need to consider vitamin D3 as a potential supportive treatment in asthma management, especially given its immunomodulatory effects. Yet, it's essential to approach these findings with caution until further evidence is gathered on its direct impact on allergies.
Read More

User Reviews

USERS' SCORE
Excellent
Based on 12 Reviews
9
  • All Reviews
  • Positive Reviews
  • Negative Reviews
9.5
Helpful for children
Excellent product; it did not cause allergies. I give my child 2 capsules now, although 400 IU might not suffice based on recommendations. They have started to experience less pain.
10
Ideal for children
The 400 IU dosage recommended by WHO for children is ideal. The supplements I found previously in Russia contained minimal doses, requiring me to give 10-15 capsules, which was inconvenient for both me and the children. Since I discovered iHerb, these vitamins have been perfect. They cause no allergies, are small capsules that my children take at bedtime, and they have shown remarkable growth and energy. I also give them Omega from the same brand. There were only a few interruptions in taking them when I forgot to reorder.
Read More
10
Well absorbed
Perfectly! This is the best Vitamin D3 from iHerb! My doctor recommended I take 2000 IU during pregnancy, so I take 3 capsules each morning. It does not cause any allergies, is well absorbed, and is easy to swallow due to its small size.
10
Increased energy
Perfectly, vitamin D3 should be taken after testing, but I opted for a small dosage. This isn't a lifesaver, yet even just a small amount works! I experienced a surge of energy, making it easier to rise in the mornings, and I had no allergies. I highly recommend it!
10
No allergic reactions
The quality of the vitamin D is excellent and suited our family perfectly. It did not cause any allergies, and the capsules are very convenient.
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