Kelp
12 benefits mapped to clinical evidence across supplements.
Dose per serving from products
281 products in our catalogue print how much Kelp a serving holds.
Most common: 25 mg to 50 mg, 38% of 281 products.
| Dose per serving | Products |
|---|---|
| 100 mcg or less | 12 |
| 100 mcg to 250 mcg | 27 |
| 250 mcg to 500 mcg | 0 |
| 500 mcg to 1 mg | 0 |
| 1 mg to 2.5 mg | 2 |
| 2.5 mg to 5 mg | 5 |
| 5 mg to 10 mg | 12 |
| 10 mg to 25 mg | 36 |
| 25 mg to 50 mg | 106 |
| 50 mg to 100 mg | 33 |
| 100 mg to 250 mg | 22 |
| 250 mg to 500 mg | 6 |
| 500 mg to 1 g | 12 |
| over 1 g | 8 |
Dose per serving from research
5 study groups in 4 studies say how much Kelp participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 1 g to 2.5 g, 60% of 5 study groups.
| Daily dose | Study groups |
|---|---|
| 1 g to 2.5 g | 3 |
| 2.5 g to 5 g | 0 |
| 5 g to 10 g | 1 |
| 10 g to 25 g | 1 |
Benefit Evidence
Research sources
Metabolism (3)
- Ascophyllum nodosum and Fucus vesiculosus on glycemic status and on endothelial damage markers in dysglicemic patients
PubMed ID: 30714233
Nutraceutical with Ascophyllum/Fucus + chromium improved HbA1c, fasting/postprandial glucose and HOMA-IR in dysglycemic patients (randomized trial, confounded by chromium).
- [Clinical assessment of dietary correction of metabolic syndrome by using specialized food product enriched with chrome]
PubMed ID: 24006749
Laminaria jam plus lifestyle produced improvements in weight, BP and glycaemic markers over 6 months (combined intervention; chromium confounds attribution).
- Marginal Impact of Brown Seaweed Ascophyllum nodosum and Fucus vesiculosus Extract on Metabolic and Inflammatory Response in Overweight and Obese Prediabetic Subjects
PubMed ID: 35323474
12-week extract trial in overweight prediabetic adults reduced late-phase C‑peptide and blunted inflammatory rise, suggesting modest metabolic modulation.
Nutrition source (2)
- Effects of kelp supplementation on thyroid function in euthyroid subjects
PubMed ID: 14583417
Kelp supplementation produced urinary iodine changes and thyroid hormone shifts consistent with iodine delivery.
- Plasma lipoproteins in hyperlipidemic subjects eating iodine-enriched eggs
PubMed ID: 1619181
Feeding hens kelp produced iodine-enriched eggs, demonstrating kelp as an iodine source that transfers into food.
Inflammation (2)
- Marginal Impact of Brown Seaweed Ascophyllum nodosum and Fucus vesiculosus Extract on Metabolic and Inflammatory Response in Overweight and Obese Prediabetic Subjects
PubMed ID: 35323474
12-week brown-seaweed extract blunted IL‑6 increase compared with placebo, indicating anti-inflammatory effect in overweight prediabetics.
- Ascophyllum nodosum and Fucus vesiculosus on glycemic status and on endothelial damage markers in dysglicemic patients
PubMed ID: 30714233
Nutraceutical with Ascophyllum/Fucus + chromium reduced hs‑CRP and TNF‑α in dysglycemic patients (randomized trial; chromium confounds attribution).
Antioxidant (2)
- Antioxidant effects of fermented sea tangle (Laminaria japonica) by Lactobacillus brevis BJ20 in individuals with high level of γ-GT: A randomized, double-blind, and placebo-controlled clinical study
PubMed ID: 22138360
Fermented kelp (1.5 g/day) improved antioxidant markers (decreased MDA, increased SOD) in people with elevated γ‑GT (small RCT).
- The Effects of Fermented Laminaria japonica on Short-Term Working Memory and Physical Fitness in the Elderly
PubMed ID: 30008787
Fermented Laminaria in older adults increased SOD/GPx/GSR, decreased TBARS and 8-oxo-dG — robust human antioxidant biomarker improvements (randomized trial).
Heart health (2)
- Marginal Impact of Brown Seaweed Ascophyllum nodosum and Fucus vesiculosus Extract on Metabolic and Inflammatory Response in Overweight and Obese Prediabetic Subjects
PubMed ID: 35323474
12-week extract reduced heart rate and blunted IL‑6 rise in overweight prediabetic adults—favorable for cardiovascular parameters.
- [Clinical assessment of dietary correction of metabolic syndrome by using specialized food product enriched with chrome]
PubMed ID: 24006749
Laminaria jam plus lifestyle produced notable LDL and BP improvements over 6 months, supporting cardiovascular risk factor improvement (combined intervention).
Hormone balance (2)
- Ascophyllum nodosum and Fucus vesiculosus on glycemic status and on endothelial damage markers in dysglicemic patients
PubMed ID: 30714233
Improved insulin resistance (HOMA‑IR) and glycaemia in dysglycemic patients indicates effects on metabolic hormones (insulin).
- Effects of kelp supplementation on thyroid function in euthyroid subjects
PubMed ID: 14583417
Clear, dose-dependent TSH and thyroid-hormone changes after kelp supplementation in healthy people consistent with an iodine-driven effect on thyroid function.
Weight management (2)
- Effects of Daily Kelp (Laminaria japonica) Intake on Body Composition, Serum Lipid Levels, and Thyroid Hormone Levels in Healthy Japanese Adults: A Randomized, Double-Blind Study
PubMed ID: 34206160
Daily boiled (iodine-reduced) kelp for 8 weeks led to modest body‑fat loss in men (randomized trial, gender-limited effect).
- [Clinical assessment of dietary correction of metabolic syndrome by using specialized food product enriched with chrome]
PubMed ID: 24006749
Laminaria jam plus lifestyle changes produced larger weight and waist reductions versus lifestyle alone over 6 months (clinical study; chromium and concurrent interventions confound attribution).
Energy & Fatigue (1)
- The Effects of Fermented Laminaria japonica on Short-Term Working Memory and Physical Fitness in the Elderly
PubMed ID: 30008787
Fermented Laminaria increased IGF‑1/BDNF and improved short-term physical tests in older adults, consistent with improved energy/functional capacity.
Mental clarity (1)
- The Effects of Fermented Laminaria japonica on Short-Term Working Memory and Physical Fitness in the Elderly
PubMed ID: 30008787
Fermented Laminaria increased BDNF/IGF-1 and improved cognitive test scores in older adults (randomized trial).
Mood balance (1)
- The Effects of Fermented Laminaria japonica on Short-Term Working Memory and Physical Fitness in the Elderly
PubMed ID: 30008787
Increased BDNF and improved cognitive/functional scores in older adults suggest potential benefits for mood/stress resilience (indirect).
Detoxification (1)
- Antioxidant effects of fermented sea tangle (Laminaria japonica) by Lactobacillus brevis BJ20 in individuals with high level of γ-GT: A randomized, double-blind, and placebo-controlled clinical study
PubMed ID: 22138360
Fermented kelp decreased γ‑GT (a liver enzyme) and oxidative markers, suggesting improved hepatic oxidative status/detox markers in a small RCT.
Digestive support (1)
- Laminaria japonica combined with probiotics improves intestinal microbiota: a randomized clinical trial
PubMed ID: 24456357
Small randomized human trial: Laminaria japonica + probiotics increased counts of several lactic acid bacteria species in stool — direct evidence of microbiota modulation.
Similar by evidence
Supplements the same benefits carry qualifying findings for — a fact about the evidence graph, not a recommendation to swap.
Products with Kelp
Search all780 products whose verified label declares Kelp — not every bottle that mentions it in a title.