Source Naturals Day Starter supplement bottle
Source Naturals

Day Starter

What We Researched
3 active ingredients analyzed · 6 inactive ingredients decoded · 1 brand certification checked · 1 retailer compared · Last updated: Mar 2026
83
Product Score Good
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium 21 mg 2%
Green Tea leaf extract (as Caffeine) 200 mg
L-Theanine 200 mg
Bioavailability Excellent

Absorption Rating

  • Calcium Good
  • Green Tea leaf extract (as Caffeine) Good
  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Dibasic Calcium Phosphate
  • Hydroxypropyl Cellulose
  • Magnesium Stearate
  • Modified Cellulose Gum
  • Silica
Efficacy Poor

Dosage Analysis

  • Calcium 21 mg Under-dosed
  • Green Tea leaf extract (as Caffeine) 200 mg Under-dosed
  • L-Theanine 200 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calcium 21 mg 2%
Green Tea leaf extract (as Caffeine) 200 mg
L-Theanine 200 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Dibasic Calcium Phosphate Generally_safe

It is used as a filler and to improve tablet hardness.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Modified Cellulose Gum Generally_safe

It is used to improve the texture and stability of products.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Price Comparison

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Source Naturals

Founded 1982 · Scotts Valley, CA, USA · 837 products · sourcenaturals.com/

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source
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Frequently Asked Questions
Is Source Naturals Day Starter a good supplement?

Source Naturals Day Starter received a product quality score of 83/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 3 active ingredients Of the 6 inactive ingredients, 4 are rated safe and 0 are flagged for review. The manufacturer, Source Naturals, holds a brand trust score of 66/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Source Naturals Day Starter?

Source Naturals Day Starter contains 3 active ingredients: Calcium (21 mg), Green Tea leaf extract (as Caffeine) (200 mg), L-Theanine (200 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Source Naturals Day Starter safe to take?

Source Naturals Day Starter has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Source Naturals a trustworthy supplement brand?

Source Naturals receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1982 and headquartered in Scotts Valley, CA, USA, the company offers 837 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.