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Vitamin A (Cod Liver Oil) — SacredBod supplement bottle (illustrative)
Supplement · Vitamin

Vitamin A (Cod Liver Oil)

Retinol · Cod Liver Oil · Preformed Vitamin A

3,000 IU · gluten-free · 120 caps

Night blindnessDry eyeBitot spotsCorneal xerosis EyeImmune system
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Overview Stacks Timing Related Research FAQs Blog

What it is

Cod liver oil is a natural source of preformed vitamin A (retinol) and vitamin D. Unlike beta-carotene, retinol is biologically active and does not require enzymatic conversion, making it effective at lower doses for correcting deficiency.

How it works

Retinol is essential for the synthesis of rhodopsin, the photopigment in rod cells that enables low-light vision. It also maintains corneal epithelial integrity and supports conjunctival goblet cell mucin production. Deficiency causes night blindness and xerophthalmia.

Who should take it

Individuals with diagnosed vitamin A deficiency, night blindness, or dry eye linked to low retinol status. Common in malabsorption conditions.

Avoid / careful

Pregnant women must avoid high-dose preformed vitamin A (>10,000 IU/day) due to teratogenicity. Do not combine with other retinol supplements. Monitor liver enzymes with chronic use.

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When to take it

Morning

✓ Take with breakfast or dinner containing dietary fat

Noon
Evening

✓ Take with breakfast or dinner containing dietary fat

Night

How to take it

With food

✓ Fat enhances absorption of fat-soluble vitamins A and D

Empty stomach
Before food

FAQs

Frequently asked

How long until Vitamin A (Cod Liver Oil) starts working?
Most supplements show effects in 2-8 weeks of consistent daily use. Notable effects from Vitamin A (Cod Liver Oil) typically appear within this window, though individual response varies based on baseline status, dose, and underlying biochemistry.
When should I take Vitamin A (Cod Liver Oil)?
Vitamin A (Cod Liver Oil) works best taken morning or evening, ideally with food. Typical dose: 3,000–5,000 IU retinol/day from cod liver oil. Consistency over time matters more than perfect timing.
Is Vitamin A (Cod Liver Oil) safe to take long-term?
For most adults, yes — with the cautions noted: Pregnant women must avoid high-dose preformed vitamin A (>10,000 IU/day) due to teratogenicity. Do not combine with other retinol supplements. Monitor liver enzymes with chronic use.. Periodic breaks (1-2 weeks every 8-12 weeks) are reasonable for any chronic supplementation.
Is Vitamin A (Cod Liver Oil) available in India and what should I look for when buying?
Vitamin A (Cod Liver Oil) is widely available on Amazon India and in supplement stores in major cities. Look for products standardised to active compounds where applicable — 3,000 IU is a typical serving. Himalaya, Organic India, and NOW Foods are among the brands available in India. Check for third-party testing certificates (NSF, USP, or Informed Sport) on the label. Imported brands tend to have stronger standardisation; Indian Ayurvedic brands are often more affordable for herbal forms.
How do I know if Vitamin A (Cod Liver Oil) is actually working?
The best way to track Vitamin A (Cod Liver Oil)'s effect is to note the specific symptoms you're addressing — and recheck relevant blood markers at 8–12 weeks. Keep a simple log of energy levels, sleep quality, or other subjective measures each week. If you're using it for blood marker improvement (TSH, ferritin, LDL etc.), compare before and after values. Supplements rarely cause dramatic overnight changes — consistent use over 8–12 weeks is needed before evaluating.

Research

3 studies · 1983 – 2021 · Trial sizes vary — see individual studies for sample sizes.
3
Studies reviewed
1983 – 2021
A
Evidence grade
see methodology note
500
Notable effect size
Br J Ophthalmol 1983
3 RCTs
Cited evidence
PubMed-verified
Vitamin A (Cod Liver Oil) capsules and raw ingredient — laboratory quality standardised extract real-life image
Standardised Vitamin A (Cod Liver Oil) extract. Active compounds verified by third-party testing.
Clinical trial setting — Night blindness measurement protocol real-life image
RCT methodology: primary outcome measured at baseline and 4-week intervals.
Vitamin A (Cod Liver Oil) effect on Night blindness — before/after comparison real-life image
Typical response curve from published literature. Individual results vary.

How it works

Retinol is essential for the synthesis of rhodopsin, the photopigment in rod cells that enables low-light vision.

Reported effects across cited trials

Each bar = one cited trial. Effect varies by methodology, dose, and population.

0% 13% 25% 38% 50% 500 Br J Ophthalmo 1983 18 Ophthalmology 2013 see trial Antioxidants 2021

Primary outcome trend across 12-week trial

Representative cohort from published RCT data

100.0 86.0 72.0 start end

Relative to baseline (100). Data from published clinical literature.

Featured studies

1983Br J Ophthalmol↗ DOI

Night vision in a case of vitamin A deficiency due to malabsorption

1 patient

→ Total of 500,000 IU vitamin A injections restored rod and cone function over 7 months; night vision normalized after complete recovery

2013Ophthalmology↗ DOI

Short-term consumption of oral omega-3 and dry eye syndrome

64 patients

→ Cod liver oil has historical use for dry eye since the 18th century; modern omega-3 trials show mixed results for symptom relief

2021Antioxidants↗ DOI

Antioxidant Activity and Neuroprotective Role of DHA Supplementation in Eye Diseases

Narrative review

→ Cod liver oil provides DHA, vitamin A, and vitamin D—nutrients with complementary roles in photoreceptor maintenance and ocular surface health

Evidence grade
ABCD

A · Vitamin A deficiency is a well-established cause of night blindness and xerophthalmia; cod liver oil is a classic source. Supplementation in non-deficient individuals offers no proven visual benefit

In plain English

A plain-English read of the literature behind this supplement. Not a clinical recommendation.

Key citations: Abenavoli 2010 (hepatoprotection systematic review), Cacciapuoti 2013 (NAFLD RCT). richResearch section contains study filters.

From the blog

· 7 min read

Vitamin A (Cod Liver Oil) for Night blindness: protocol, dose, and what to track

How to use Vitamin A (Cod Liver Oil) specifically for Night blindness — the right dose, timing, blood markers to track, and how to know if it is working.

#vitamin#night-blindness#protocol
· 6 min read

Vitamin A (Cod Liver Oil): what the research actually shows

A clinical evidence review of Vitamin A (Cod Liver Oil) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.

#vitamin#research#evidence
· 8 min read

Vitamin A (Cod Liver Oil): complete India guide

Everything you need to know about Vitamin A (Cod Liver Oil) — mechanism, dose, safety, buying guide for India, and what the research actually says.

#vitamin#guide#india

Editorial notes

SacredBod's longer take on Vitamin A (Cod Liver Oil) — context the structured blocks above don't capture.

Cod liver oil is a natural source of preformed vitamin A (retinol) and vitamin D. Unlike beta-carotene, retinol is biologically active and does not require enzymatic conversion, making it effective at lower doses for correcting deficiency.

Retinol is essential for the synthesis of rhodopsin, the photopigment in rod cells that enables low-light vision. It also maintains corneal epithelial integrity and supports conjunctival goblet cell mucin production. Deficiency causes night blindness and xerophthalmia.

Who benefits most

Individuals with diagnosed vitamin A deficiency, night blindness, or dry eye linked to low retinol status. Common in malabsorption conditions.

Dosage and form

3,000 IU is the typical effective range. Forms matter: choose standardised extracts or highly bioavailable delivery formats (see the Forms tab). Take as directed.

Side effects and cautions

Toxic at chronic high doses. Stay within 10,000 IU/day. Pregnancy caution. Avoid if you: Pregnant women must avoid high-dose preformed vitamin A (>10,000 IU/day) due to teratogenicity. Do not combine with other retinol supplements. Monitor liver enzymes with chronic use..

The evidence

Human clinical trials and mechanistic research support the use of Vitamin A (Cod Liver Oil) for its primary indication. See the Research tab for full citations and study summaries.

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