Hey, I'm Caroline

I'm 21, on my gap year (hopefully it'd be bioinformatics!), and my five biggest expenses are rent, my clunky jeep, ✨ clothes, my dog, and espresso. In that exact same order.

Feeling extra generous? I'm a sucker for art books, shiny dresses, oat milk lattes, and the occasional side hustle a girl doesn't talk about on a personal website like this one. (You know what I mean. Don't make it weird.) Wanna find out more? DM me!

A little coffee, a lot of curiosity.

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Click on any combination for detailed information. Self-interactions are marked with a dot (•)

Green - They complement well one another (synergistic or beneficial together). Blue - No significant interaction with one another (safe to combine, neutral). Red - They block one another (antagonistic, reduce absorption, or compete).

How Vitamins and Supplements Interact

Reviewed by Caroline M. Medical reviewer: Various Sources Last reviewed: October 20, 2026

86 items • 7,310 pairings • Last updated: October 20, 2026

Supplement	Vitamin A	Vitamin D	Vitamin E	Vitamin K	Vitamin B1	Vitamin B2	Vitamin B3	Vitamin B5	Vitamin B6	Vitamin B7	Vitamin B9	Vitamin B12	Vitamin C	Calcium	Magnesium	Potassium	Sodium	Zinc	Iron	Selenium	Iodine	Copper	Manganese	Chromium	Molybdenum	Fish Oil	Algae Oil	Krill Oil	Flaxseed Oil	Evening Primrose Oil	Cod Liver Oil	L-Lysine	L-Theanine	L-Arginine	L-Glutamine	L-Tryptophan	L-Tyrosine	Taurine	Branched-Chain Amino A...	Collagen Peptides	Whey Protein / Plant P...	Ashwagandha	Rhodiola Rosea	Holy Basil	Ginseng	Maca Root	Turmeric / Curcumin	Ginger	Garlic Extract	Echinacea	Elderberry	Milk Thistle	Ginkgo Biloba	St. John's Wort	Saw Palmetto	Valerian Root	Chamomile	Green Tea Extract	Probiotics	Prebiotics	Digestive Enzymes	Apple Cider Vinegar	Aloe Vera	Glucosamine Sulfate	Chondroitin Sulfate	MSM	Hyaluronic Acid	Boswellia Serrata	Creatine Monohydrate	Coenzyme Q10 (CoQ10) /...	NAD+ Precursors	L-Carnitine	Alpha-Lipoic Acid	Betaine	D-Ribose	Cordyceps	Melatonin	5-HTP	CBD	Choline / Citicoline /...	Inositol	PQQ	Astaxanthin	Resveratrol	Quercetin	Fucoxanthin
Vitamin A (Retinol, Beta-Carotene)	•
Vitamin D (D2, D3)		•
Vitamin E (Tocopherols, Tocotrienols)			•
Vitamin K (K1, K2)				•
Vitamin B1 (Thiamine)					•
Vitamin B2 (Riboflavin)						•
Vitamin B3 (Niacin, Niacinamide)							•
Vitamin B5 (Pantothenic Acid)								•
Vitamin B6 (Pyridoxine)									•
Vitamin B7 (Biotin)										•
Vitamin B9 (Folate, Folic Acid, Methylfolate)											•
Vitamin B12 (Cobalamin, Methylcobalamin)												•
Vitamin C (Ascorbic Acid)													•
Calcium														•
Magnesium (Citrate, Glycinate, Oxide, Threonate)															•
Potassium																•
Sodium																	•
Zinc																		•
Iron (Ferrous Sulfate, Ferrous Bisglycinate)																			•
Selenium																				•
Iodine																					•
Copper																						•
Manganese																							•
Chromium																								•
Molybdenum																									•
Fish Oil (Omega-3: EPA / DHA)																										•
Algae Oil (Plant-based Omega-3)																											•
Krill Oil																												•
Flaxseed Oil (ALA)																													•
Evening Primrose Oil (GLA)																														•
Cod Liver Oil																															•
L-Lysine																																•
L-Theanine																																	•
L-Arginine																																		•
L-Glutamine																																			•
L-Tryptophan																																				•
L-Tyrosine																																					•
Taurine																																						•
Branched-Chain Amino Acids (BCAAs: Leucine, Isoleucine, Valine)																																							•
Collagen Peptides (Types I, II, III)																																								•
Whey Protein / Plant Protein Powders																																									•
Ashwagandha																																										•
Rhodiola Rosea																																											•
Holy Basil (Tulsi)																																												•
Ginseng (Panax, Siberian, Asian)																																													•
Maca Root																																														•
Turmeric / Curcumin (often with Black Pepper/Piperine)																																															•
Ginger																																																•
Garlic Extract																																																	•
Echinacea																																																		•
Elderberry																																																			•
Milk Thistle (Silymarin)																																																				•
Ginkgo Biloba																																																					•
St. John's Wort																																																						•
Saw Palmetto																																																							•
Valerian Root																																																								•
Chamomile																																																									•
Green Tea Extract (EGCG)																																																										•
Probiotics (Lactobacillus, Bifidobacterium, Saccharomyces boulardii strains)																																																											•
Prebiotics (Inulin, FOS, GOS)																																																												•
Digestive Enzymes (Amylase, Protease, Lipase, Lactase)																																																													•
Apple Cider Vinegar (capsules/gummies)																																																														•
Aloe Vera																																																															•
Glucosamine Sulfate																																																																•
Chondroitin Sulfate																																																																	•
MSM (Methylsulfonylmethane)																																																																		•
Hyaluronic Acid																																																																			•
Boswellia Serrata																																																																				•
Creatine Monohydrate																																																																					•
Coenzyme Q10 (CoQ10) / Ubiquinol																																																																						•
NAD+ Precursors (NMN, NR – Nicotinamide Riboside)																																																																							•
L-Carnitine (Acetyl-L-Carnitine)																																																																								•
Alpha-Lipoic Acid (ALA)																																																																									•
Betaine (TMG)																																																																										•
D-Ribose																																																																											•
Cordyceps																																																																												•
Melatonin (sleep)																																																																													•
5-HTP (mood/sleep)																																																																														•
CBD (Cannabidiol)																																																																															•
Choline / Citicoline / Alpha-GPC (brain health)																																																																																•
Inositol (PCOS/mood)																																																																																	•
PQQ (Pyrroloquinoline Quinone) (cellular health)																																																																																		•
Astaxanthin (antioxidant)																																																																																			•
Resveratrol (antioxidant)																																																																																				•
Quercetin (antioxidant/histamine support)																																																																																					•
Fucoxanthin (metabolism)																																																																																						•